Smsc Usb2512 Users Manual USB 2.0 High Speed 2 Port Hub Controller Data Sheet
USB2512 2512
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2015-02-05
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USB2512
USB 2.0 High-Speed
2-Port Hub Controller
PRODUCT FEATURES
Datasheet
General Description
T h e S M S C 2 - P o r t H u b i s a l o w p o w e r, O E M
configurable, STT (Single transaction translator) hub
controller IC with 2 downstream ports for embedded
USB solutions. The 2-port hub is fully compliant with the
USB 2.0 Specification and will attach to an upstream
port as a Full-Speed Hub or as a Full-/High-Speed Hub.
The 2-Port Hub supports Low-Speed, Full- Speed, and
High-Speed (if operating as a High-Speed Hub)
downstream devices on all of the enabled downstream
ports.
General Features
Hub Controller IC with 2 downstream ports
Enhanced OEM configuration options available
through either a single serial I2C EEPROM, or
SMBus Slave Port
36-pin (6x6mm) QFN lead-free, RoHS compliant
package
Hardware Features
— Select Downstream Ports as Non-Removable Ports
Applications
Low power operation
Full Power Management with individual or ganged
power control of each downstream port
On-chip Power On Reset (POR)
Internal 1.8V Voltage Regulator
Fully integrated USB termination and Pull-up/Pulldown resistors
On Board 24MHz Crystal Driver, Resonator or
External 24MHz clock input
Enhanced EMI rejection and ESD protection
performance
Programmable USB signal drive strength. Recover
USB signal integrity due to compromised system
environment using 2-level driving strength resolution
Select the presence of a permanently hardwired USB
peripheral device on a port by port basis
Configure the delay time for filtering the over-current
sense inputs
Configure the delay time for turning on downstream
port power
Indicate the maximum current that the 2-port hub
consumes from the USB upstream port
Indicate the maximum current required for the hub
controller
Pin Selectable Options for Default Configuration
LCD monitors and TVs
Multi-function USB peripherals
PC mother boards
Set-top boxes, DVD players, DVR/PVR
Printers and scanners
PC media drive bay
Portable hub boxes
Mobile PC docking
Embedded systems
OEM Selectable Features
Customize Vendor ID, Product ID, and Device ID
Select whether the hub is part of a compound device
(When any downstream port is permanently
hardwired to a USB peripheral device, the hub is part
of a compound device)
Flexible port mapping and disable sequence. Ports
can be disabled/reordered in any order to support
multiple product SKUs. Hub will automatically reorder
the remaining ports to match the Host controller's
numbering scheme.
Programmable USB differential-pair pin location.
Ease PCB layout by aligning USB signal lines directly
to connectors
SMSC USB2512
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
ORDER NUMBER(S):
USB2512-AEZG FOR 36 PIN, QFN LEAD-FREE ROHS COMPLIANT PACKAGE
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
Copyright © 2007 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered
trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;
TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD
TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Revision 1.92 (11-28-07)
2
DATASHEET
SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Table of Contents
Chapter 1 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chapter 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 3 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1
3.2
PIN Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 4 Configuration Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1
4.2
4.3
4.4
4.5
4.6
2-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.1
Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.2
VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1
Internal Register Set (Common to EEPROM and SMBus) . . . . . . . . . . . . . . . . . . . . . . .
4.2.2
I2C EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.3
In-Circuit EEPROM Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.1
Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.2
Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.3
General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.4
Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.5
Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.6
SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.7
Bus Reset Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.8
SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6.1
Internal POR Hardware Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6.2
External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6.3
USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
13
13
13
13
24
25
25
25
26
26
26
27
27
27
27
27
27
27
27
28
30
Chapter 5 DC Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.1
5.2
Maximum Guaranteed Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Recommended Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Chapter 6 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.1
Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1.1
SMBus Interface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1.2
I2C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1.3
USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
36
36
36
Chapter 7 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
SMSC USB2512
3
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
List of Figures
Figure 1.1
Figure 2.1
Figure 4.1
Figure 4.2
Figure 4.3
Figure 4.4
Figure 4.5
Figure 6.1
Figure 6.2
Figure 7.1
USB2512 36-Pin QFN (Embedded Footprint) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
USB2512 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Block Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Block Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Typical Crystal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Formula to find value of C1 and C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
36-Pin QFN, 6x6mm Body, 0.5mm Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
SMSC USB2512
4
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
List of Tables
Table 3.1
Table 3.2
Table 3.3
Table 3.4
Table 4.1
Table 4.2
Table 4.3
Table 4.4
Table 4.5
Table 5.1
Table 5.2
USB2512 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
USB2512 Power, Ground, and No Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
USB2512 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Internal Default, EEPROM and SMBus Register Memory Map. . . . . . . . . . . . . . . . . . . . . . . . 13
Port Remap Register for Ports 1 & 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Pin Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
SMSC USB2512
5
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
VBUS_DET
RESET_N
HS_IND/CFG_SEL1
SCL/SMBCLK/CFG_SEL0
VDD33
SDA/SMBDATA/NON_REM1
NC
NC
NC
27
26
25
24
23
22
21
20
19
Chapter 1 Pin Configuration
SUSP_IND/LOCAL_PWR/NON_REM0
28
18
NC
VDDA33
29
17
OCS2_N
USBUP_DM
30
16
PRTPWR2
USBUP_DP
31
15
VDD33CR
14
VDD18
13
OCS1_N
12
PRTPWR1
11
TEST
10
VDDA33
5
6
7
8
9
NC
NC
NC
NC
USBDN1_DM
VDDA33
36
4
35
USBDN2_DP
RBIAS
VDD33PLL
Thermal Slug
(must be connected to VSS)
3
34
2
VDD18PLL
USBDN1_DP
33
USBDN2_DM
32
1
XTAL2
XTAL1/CLKIN
SMSC
USB2512
Embedded Footprint
(Top View QFN-36)
Indicates pins on the bottom of the device.
Figure 1.1 USB2512 36-Pin QFN (Embedded Footprint)
SMSC USB2512
6
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Chapter 2 Block Diagram
T o U p stre a m
V BUS
U p stre a m U S B
D a ta
To EEPR O M or
S M B u s M a ste r
2 4 M H z C rysta l
3 .3 V
1 .8 V
PLL
B u s -P o w e r
D e te c t/V B U S
P u ls e
U p s tre a m
PHY
SD
SCK
S e ria l
In te rfa c e
1 .8 V R e g
S IE
R e p e a te r
C o n tro lle r
P o rt
C o n tro lle r
TT
R o u tin g & P o rt R e -O rd e rin g L o g ic
PH Y#1
P o rt # 1
P o rt # 2
OC
S en se
S w itch
D riv er
LED
D rive rs
OC
S en s e
S w itc h
D rive r
LED
D rivers
PH Y#2
U S B D a ta O C S e nse
D ow n strea m S w itch /LE D
D rive rs
U S B D a ta
D ow n strea m
O C S en se
S w itch/L E D
D rivers
Figure 2.1 USB2512 Block Diagram
SMSC USB2512
7
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Chapter 3 Pin Descriptions
3.1
PIN Descriptions
This section provides a detailed description of each signal. The signals are arranged in functional
groups according to their associated interface.
The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal
is at a low voltage level. When “N” is not present before the signal name, the signal is asserted when
at the high voltage level.
The terms assertion and negation are used exclusively. This is done to avoid confusion when working
with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a
signal is active, independent of whether that level is represented by a high or low voltage. The term
negate, or negation, indicates that a signal is inactive.
Table 3.1 USB2512 Pin Descriptions
SYMBOL
QFN-36
EMB
BUFFER
TYPE
DESCRIPTION
UPSTREAM USB INTERFACES
USBUP_DP
USBUP_DM
31
30
IO-U
VBUS_DET
27
I/O12
USB Bus Data
These pins connect to the upstream USB bus data signals
(Host port, or upstream hub).
Detect Upstream VBUS Power
Detects state of Upstream VBUS power. The SMSC Hub
monitors VBUS_DET to determine when to assert the internal
D+ pull-up resistor (signaling a connect event).
When designing a detachable hub, this pin must be connected
to the VBUS power pin of the USB port that is upstream of the
hub.
For self-powered applications with a permanently attached
host, this pin must be connected to 3.3V (typically VDD33).
DOWNSTREAM 2-PORT USB 2.0 INTERFACE
USBDN_DP[2:1]/
&
USBDN_DM[2:1]/
PRTPWR[2:1]
4
2
IO-U
These pins connect to the downstream USB peripheral devices
attached to the hub’s port.
3
1
16
12
High-Speed USB Data
O12
USB Power Enable
Enables power to USB peripheral devices downstream.
Note: The hub supports active high power controllers only!
OCS[2:1]_N
RBIAS
17
13
IPU
35
I-R
Over Current Sense
Input from external current monitor indicating an over-current
condition.
{Note: Contains internal pull-up to 3.3V supply}
USB Transceiver Bias
A 12.0kΩ (+/- 1%) resistor is attached from ground to this pin
to set the transceiver’s internal bias settings.
SMSC USB2512
8
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Table 3.1 USB2512 Pin Descriptions (continued)
SYMBOL
QFN-36
EMB
BUFFER
TYPE
DESCRIPTION
SERIAL PORT INTERFACE
SDA/
SMBDATA/
NON_REM1
22
I/OSD12
Serial Data / SMB Data & Port Non Removable Strap Option
NON_REM1: Non removable port strap
option.
If this strap is enabled by package and configuration settings
(see Table 3.2), this pin will be sampled (in conjunction
with LOCAL_PWR/SUSP_IND/NON_REM0) at RESET_N
negation to determine if imports [2:1] contain permanently
attached
(non-removable) devices:
NON_REM[1:0] = ‘00’, All ports are removable.
NON_REM[1:0] = ‘01’, Port 1 is nonremovable.
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable.
NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable.
SCL/
24
I/OSD12
SMBus Clock (SMBCLK)
SMBCLK/
Configuration Select_SEL0: The logic state of this multifunction
pin is internally latched on the rising edge of RESET_N
(RESET_N negation), and will determine the hub configuration
method as described in Table 3.2, "SMBus or EEPROM
Interface Behavior".
CFG_SEL0
HS_IND/
CFG_SEL1
Serial Clock (SCL)
25
I/O12
High-Speed Upstream port indictor & Configuration
Programming Select
HS_IND: High Speed Indicator for upstream port connection
speed.
The active state of the LED will be determined as follows:
CFG_SEL1 = ‘0’,
HS_IND is active high,
CFG_SEL1 = ‘1’,
HS_IND is active low,
‘Asserted’ = Hub is connected at HS
‘Negated’ = Hub is connected at FS
CFG_SEL1: The logic state of this pin is internally latched on
the rising edge of RESET_N (RESET_N negation), and will
determine the hub configuration method as described in
Table 3.2, "SMBus or EEPROM Interface Behavior".
MISC
XTAL1/
CLKIN
Revision 1.92 (11-28-07)
33
ICLKx
Crystal Input/External Clock Input
24MHz crystal or external clock input.
This pin connects to either one terminal of the crystal or to an
external 24MHz clock when a crystal is not used.
9
DATASHEET
SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Table 3.1 USB2512 Pin Descriptions (continued)
SYMBOL
QFN-36
EMB
BUFFER
TYPE
XTAL2
32
OCLKx
DESCRIPTION
Crystal Output
24MHz Crystal
This is the other terminal of the crystal, or a NO-CONNECT
when an external clock source is used to drive XTAL1/CLKIN.
This output must not be used to drive any external circuitry
other than the crystal circuit.
RESET_N
26
IS
RESET Input
The system can reset the chip by driving this input low. The
minimum active low pulse is 1 us.
When the RESET_N pin is pulled to VDD33, the internal POR
(Power on Reset) is enabled and no external reset circuitry is
required. The internal POR holds the internal logic in reset until
the power supplies are stable.
SUSP_IND/
LOCAL_PWR/
NON_REM0
28
I/O
Active/Suspend status LED or Local-Power & Non Removable
Strap Option
Suspend Indicator: Indicates USB state of the hub.
‘negated’ = Unconfigured, or configured and in USB Suspend
‘asserted’ = Hub is configured, and is active (i.e., not in
suspend)
Local Power: Detects availability of local self-power source.
Low = Self/local power source is NOT available (i.e., Hub gets
all power from Upstream USB VBus).
High = Self/local power source is available.
NON_REM0 Strap Option:
If this strap is enabled by package and configuration settings
(see Table 3.2), this pin will be sampled (in conjunction with
NON_REM1) at RESET_N negation to determine if ports [2:1]
contain permanently attached (non-removable) devices. Also,
the active state of the LED
will be determined as follows:
NON_REM[1:0] = ‘00’, All ports are removable, and the LED is
active high
NON_REM[1:0] = ‘01’, Port 1 is nonremovable, and the LED is
active low
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable, and the
LED is active high
NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable, and the
LED is active low
TEST
11
IPD
TEST pin
Used for testing the chip. User must treat as a no-connect or
connect to ground.
Table 3.2 SMBus or EEPROM Interface Behavior
CFG_SEL1
CFG_SEL0
0
0
SMSC USB2512
SMBUS OR EEPROM INTERFACE BEHAVIOR
Internal Default Configuration
Strap Options Enabled
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DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Table 3.2 SMBus or EEPROM Interface Behavior (continued)
CFG_SEL1
CFG_SEL0
SMBUS OR EEPROM INTERFACE BEHAVIOR
0
1
Configured as an SMBus slave for external download of user-defined
descriptors.
SMBus slave address 58 (0101100x)
Strap Options Disabled
All Settings Controlled by Registers
1
0
Internal Default Configuration
Strap Options Enabled
Bus Power Operation
1
1
2-Wire I2C EEPROMS are supported.
Strap Options Disabled
All Settings Controlled by Registers
Table 3.3 USB2512 Power, Ground, and No Connect
PACKAGE SYMBOL
36-QFN EMB
VDD18
14
FUNCTION
VDD Core
This pin must have a 1.0μF (or greater) ±20% (ESR <0.1Ω) capacitor to
VSS.
VDD33PLL
36
VDD 3.3 PLL Regulator Reference
+3.3V power supply for the PLL. If the internal PLL 1.8V regulator
is enabled, then this pin acts as the regulator input.
VDDPLL18
34
VDD PLL
This pin must have a 1.0μF (or greater) ±20% (ESR <0.1Ω) capacitor to
VSS.
VDDA33
VDD33/VDD33CR
NC
Revision 1.92 (11-28-07)
5
10
29
VDD Analog I/O
23
15
VDDIO/VDD 3.3 Core Regulator Reference
6
7
8
9
18
19
20
21
No Connect
+3.3V Filtered analog PHY power, shared between adjacent ports.
+3.3V power supply for the Digital I/O
If the internal core regulator is enabled, then VDD33CR acts as the
regulator input.
Leave unconnected on the circuit board.
11
DATASHEET
SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
3.2
Buffer Type Descriptions
Table 3.4 USB2512 Buffer Type Descriptions
BUFFER
I
DESCRIPTION
Input.
IPD
Input with internal weak pull-down resistor.
IPU
Input with internal weak pull-up resistor.
IS
O12
Input with Schmitt trigger.
Output 12mA.
OD12
Open drain... 12mA sink.
I/O12
Input/Output buffer with 12mA sink and 12mA source.
I/OSD12
Open drain...12mA sink with Schmitt trigger, and must meet I2C-Bus Specification
Version 2.1 requirements.
ICLKx
XTAL clock input.
OCLKx
XTAL clock output.
I-R
I/O-U
AIO
SMSC USB2512
RBIAS.
Analog Input/Output Defined in USB specification.
Analog Input/Output.
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Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Chapter 4 Configuration Options
4.1
2-Port Hub
SMSC’s USB 2.0 2-Port Hub is fully specification compliant to the Universal Serial Bus Specification
Revision 2.0 April 27,2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 10 (Hub
Specification) for general details regarding Hub operation and functionality.
The 2-Port Hub provides 1 Transaction Translator (TT) that is shared by both downstream ports
(defined as Single-TT configuration), The TT contains 4 non-periodic buffers.
4.1.1
Hub Configuration Options
The SMSC Hub supports a large number of features (some are mutually exclusive), and must be
configured in order to correctly function when attached to a USB host controller. There are three
principal ways to configure the hub: SMBus, EEPROM, or by internal default settings (with or without
pin strapping option over-rides). In all cases, the configuration method will be determined by the
CFG_SEL1 and CFG_SEL0 pins immediately after RESET_N negation.
4.1.1.1
Power Switching Polarity
The hub only supports “active high” port power controllers.
4.1.2
VBus Detect
According to Section 7.2.1 of the USB 2.0 Specification, a downstream port can never provide power
to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.
The VBUS_DET pin on the Hub monitors the state of the upstream VBUS signal and will not pull-up
the D+ resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not Powered),
Hub will remove power from the D+ pull-up resistor within 10 seconds.
4.2
EEPROM Interface
The SMSC Hub can be configured via a 2-wire (I2C) EEPROM (256x8). (Please see Table 3.1 for
specific details on how to enable configuration via an I2C EEPROM).
The Internal state-machine will (when configured for EEPROM support) read the external EEPROM for
configuration data. The hub will then “attach” to the upstream USB host.
Note: The Hub does not have the capacity to write, or “Program,” an external EEPROM. The Hub only
has the capability to read external EEPROMs. The external eeprom will be read (even if it is blank or
non-populated), and the hub will be “configured” with the values that are read.
Please see Internal Register Set (Common to EEPROM and SMBus) for a list of data fields available.
4.2.1
Internal Register Set (Common to EEPROM and SMBus)
Table 4.1 Internal Default, EEPROM and SMBus Register Memory Map
ABBR
INTERNAL
DEFAULT ROM
SMBUS AND
EEPROM POR
VALUES
VID LSB
VIDL
24h
0x00
R/W
VID MSB
VIDM
04h
0x00
R/W
PID LSB
PIDL
12h
0x00
REG
ADDR
R/W
REGISTER NAME
00h
R/W
01h
02h
SMSC USB2512
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DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Table 4.1 Internal Default, EEPROM and SMBus Register Memory Map (continued)
ABBR
INTERNAL
DEFAULT ROM
SMBUS AND
EEPROM POR
VALUES
PID MSB
PIDM
25h
0x00
R/W
DID LSB
DIDL
00h
0x00
05h
R/W
DID MSB
DIDM
00h
0x00
06h
R/W
Config Data Byte 1
CFG1
8Bh
0x00
07h
R/W
Config Data Byte 2
CFG2
10h
0x00
08h
R/W
Config Data Byte 3
CFG3
00h
0x00
09h
R/W
Non-Removable Devices
NRD
00h
0x00
0Ah
R/W
Port Disable (Self)
PDS
08h
0x00
0Bh
R/W
Port Disable (Bus)
PDB
08h
0x00
0Ch
R/W
Max Power (Self)
MAXPS
01h
0x00
0Dh
R/W
Max Power (Bus)
MAXPB
64h
0x00
0Eh
R/W
Hub Controller Max Current
(Self)
HCMCS
01h
0x00
0Fh
R/W
Hub Controller Max Current
(Bus)
HCMCB
64h
0x00
10h
R/W
Power-on Time
PWRT
32h
0x00
11h-F5h
R/W
Reserved
N/A
01h
0x00
F6h
R/W
Boost_Up
BOOSTUP
00h
0x00
F7h
R/W
Reserved
N/A
00h
0x00
F8h
R/W
Boost_2:0
BOOST20
00h
0x00
F9h
R/W
Reserved
N/A
00h
0x00
FAh
R/W
Port Swap
PRTSP
00h
0x00
FBh
R/W
Port Remap 12
PRTR12
00h
0x00
FC-FEh
R/W
Reserved
N/A
00h
0x00
FFh
R/W
Status/Command
Note: SMBus register only
STCD
00h
0x00
REG
ADDR
R/W
REGISTER NAME
03h
R/W
04h
4.2.1.1
Register 00h: Vendor ID (LSB)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
VID_LSB
Least Significant Byte of the Vendor ID. This is a 16-bit value that uniquely
identifies the Vendor of the user device (assigned by USB-Interface Forum).
This field is set by the OEM using either the SMBus or EEPROM interface
options.
Revision 1.92 (11-28-07)
14
DATASHEET
SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.2.1.2
Register 01h: Vendor ID (MSB)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
VID_MSB
Most Significant Byte of the Vendor ID. This is a 16-bit value that uniquely
identifies the Vendor of the user device (assigned by USB-Interface Forum).
This field is set by the OEM using either the SMBus or EEPROM interface
options.
4.2.1.3
Register 02h: Product ID (LSB)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PID_LSB
Least Significant Byte of the Product ID. This is a 16-bit value that the Vendor
can assign that uniquely identifies this particular product (assigned by OEM).
This field is set by the OEM using either the SMBus or EEPROM interface
options.
4.2.1.4
Register 03h: Product ID (MSB)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PID_MSB
Most Significant Byte of the Product ID. This is a 16-bit value that the Vendor
can assign that uniquely identifies this particular product (assigned by OEM).
This field is set by the OEM using either the SMBus or EEPROM interface
options.
4.2.1.5
Register 04h: Device ID (LSB)
BIT
NUMBER
BIT NAME
7:0
DID_LSB
4.2.1.6
DESCRIPTION
Least Significant Byte of the Device ID. This is a 16-bit device release
number in BCD format (assigned by OEM). This field is set by the OEM
using either the SMBus or EEPROM interface options.
Register 05h: Device ID (MSB)
BIT
NUMBER
BIT NAME
7:0
DID_MSB
SMSC USB2512
DESCRIPTION
Most Significant Byte of the Device ID. This is a 16-bit device release
number in BCD format (assigned by OEM). This field is set by the OEM
using either the SMBus or EEPROM interface options.
15
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.2.1.7
Register 06h: CONFIG_BYTE_1
BIT
NUMBER
BIT NAME
7
SELF_BUS_PWR
DESCRIPTION
Self or Bus Power: Selects between Self- and Bus-Powered operation.
The Hub is either Self-Powered (draws less than 2mA of upstream bus
power) or Bus-Powered (limited to a 100mA maximum of upstream power
prior to being configured by the host controller).
When configured as a Bus-Powered device, the SMSC Hub consumes less
than 100mA of current prior to being configured. After configuration, the BusPowered SMSC Hub (along with all associated hub circuitry, any embedded
devices if part of a compound device, and 100mA per externally available
downstream port) must consume no more than 500mA of upstream VBUS
current. The current consumption is system dependent, and the OEM must
ensure that the USB 2.0 specifications are not violated.
When configured as a Self-Powered device, <1mA of upstream VBUS
current is consumed and all ports are available, with each port being capable
of sourcing 500mA of current.
This field is set by the OEM using either the SMBus or EEPROM interface
options.
Please see the description under Dynamic Power for the self/bus power
functionality when dynamic power switching is enabled.
0 = Bus-Powered operation
1 = Self-Powered operation
Note: If Dynamic Power Switching is enabled, this bit is ignored and the
LOCAL_PWR pin is used to determine if the hub is operating from self or
bus power.
6
Reserved
5
HS_DISABLE
Reserved
High Speed Disable: Disables the capability to attach as either a High/Fullspeed device, and forces attachment as Full-speed only (i.e. no High-Speed
support).
0 = High-/Full-Speed
1 = Full-Speed-Only (High-Speed disabled!)
4
Reserved
3
EOP_DISABLE
Reserved
EOP Disable: Disables EOP generation of EOF1 when in Full-Speed mode.
During FS operation only, this permits the Hub to send EOP if no
downstream traffic is detected at EOF1. See Section 11.3.1 of the USB 2.0
Specification for additional details. Note: generation of an EOP at the EOF1
point may prevent a Host controller (operating in FS mode) from placing the
USB bus in suspend.
0 = EOP generation is normal
1 = EOP generation is disabled
2:1
CURRENT_SNS
Over Current Sense: Selects current sensing on a port-by-port basis, all
ports ganged, or none (only for bus-powered hubs). The ability to support
current sensing on a port or ganged basis is hardware implementation
dependent.
00 = Ganged sensing (all ports together)
01 = Individual port-by-port
1x = Over current sensing not supported (must only be used with BusPowered configurations!)
Revision 1.92 (11-28-07)
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DATASHEET
SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
BIT
NUMBER
BIT NAME
DESCRIPTION
0
PORT_PWR
Port Power Switching: Enables power switching on all ports simultaneously
(ganged), or port power is individually switched on and off on a port- by-port
basis (individual). The ability to support power enabling on a port or ganged
basis is hardware implementation dependent.
0 = Ganged switching (all ports together)
1 = Individual port-by-port switching
4.2.1.8
Register 07h: Configuration Data Byte 2
BIT
NUMBER
BIT NAME
DESCRIPTION
7
DYNAMIC
Dynamic Power Enable: Controls the ability of the Hub to automatically
change from Self-Powered operation to Bus-Powered operation if the local
power source is removed or is unavailable (and from Bus-Powered to SelfPowered if the local power source is restored). {Note: If the local power
source is available, the Hub will always switch to Self-Powered operation.}
When Dynamic Power switching is enabled, the Hub detects the availability
of a local power source by monitoring the external LOCAL_PWR pin. If the
Hub detects a change in power source availability, the Hub immediately
disconnects and removes power from all downstream devices and
disconnects the upstream port. The Hub will then re-attach to the upstream
port as either a Bus-Powered Hub (if local-power is unavailable) or a SelfPowered Hub (if local power is available).
0 = No Dynamic auto-switching
1 = Dynamic Auto-switching capable
6
Reserved
5:4
OC_TIMER
Reserved
OverCurrent Timer: Over Current Timer delay.
00 = 0.1ms
01 = 4ms
10 = 8ms
11 = 16ms
3
COMPOUND
Compound Device: Allows the OEM to indicate that the Hub is part
of a compound (see the USB Specification for definition) device. The
applicable port(s) must also be defined as having a "Non-Removable
Device".
Note: When configured via strapping options, declaring a port as
non-removable automatically causes the hub controller to report that
it is part of a compound device.
0 = No
1 = Yes, Hub is part of a compound device
2:0
SMSC USB2512
Reserved
Reserved
17
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.2.1.9
Register 08h: Configuration Data Byte 3
BIT
NUMBER
BIT NAME
7:4
Reserved
3
PRTMAP_EN
DESCRIPTION
Reserved
Port Re-mapping enable: Selects the method used by the hub to assign port
numbers and disable ports.
‘0’ = Standard Mode
‘1’ = Port Re-map mode
2:0
4.2.1.10
Reserved
Reserved
Register 09h: Non-Removable Device
BIT
NUMBER
BIT NAME
7:0
NR_DEVICE
DESCRIPTION
Non-Removable Device: Indicates which port(s) include non-removable
devices. ‘0’ = port is removable, ‘1’ = port is non-removable.
Informs the Host if one of the active ports has a permanent device that is
undetachable from the Hub. (Note: The device must provide its own
descriptor data.)
When using the internal default option, the NON_REM[1:0] pins will
designate the appropriate ports as being non- removable.
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Revision 1.92 (11-28-07)
7=
6=
5=
4=
3=
2=
1=
0=
Reserved, always = ‘0’
Reserved, always = ‘0’
Reserved, always = ‘0’
Reserved, always = ‘0’
Reserved, always = ‘1’
1; Port 2 non-removable
1; Port 1 non removable
Reserved, always = ‘0’
18
DATASHEET
SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.2.1.11
Register 0Ah: Port Disable For Self Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PORT_DIS_SP
Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
During Self-Powered operation when remapping mode is disabled
(PRTMAP_EN='0'), this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a Host
Controller. The ports can be disabled in any order, the internal logic will
automatically report the correct number of enabled ports to the USB Host,
and will reorder the active ports in order to ensure proper function.
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
4.2.1.12
7=
6=
5=
4=
3=
2=
1=
0=
Reserved, always = ‘0’
Reserved, always = ‘0’
Reserved, always = ‘0’
Reserved, always = ‘0’
Reserved, always = ‘1’
1; Port 2 is disabled
1; Port 1 is disabled
Reserved, always = ‘0’
Register 0Bh: Port Disable For Bus Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PORT_DIS_BP
Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
During Self-Powered operation when remapping mode is disabled
(PRTMAP_EN='0'), this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a Host
Controller. The ports can be disabled in any order, the internal logic will
automatically report the correct number of enabled ports to the USB Host,
and will reorder the active ports in order to ensure proper function.
When using the internal default option, the PRT_DIS[1:0] pins will disable the
appropriate ports.
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
4.2.1.13
7= Reserved
6= Reserved
5= Reserved
4= Reserved
3= Reserved, always = ‘1’
2= 1; Port 2 is disabled
1= 1; Port 1 is disabled
0 is Reserved, always = ‘0’
Register 0Ch: Max Power For Self Powered Operation
BIT
NUMBER
SMSC USB2512
BIT NAME
DESCRIPTION
19
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
7:0
MAX_PWR_SP
Max Power Self_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a self-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
Note:
4.2.1.14
The USB 2.0 Specification does not permit this value to exceed
100mA
Register 0Dh: Max Power For Bus Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
MAX_PWR_BP
Max Power Bus_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a bus-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
4.2.1.15
Register 0Eh: Hub Controller Max Current For Self Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
HC_MAX_C_SP
Hub Controller Max Current Self-Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a selfpowered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
Note:
The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA, which is the default value.
4.2.1.16
Register 0Fh: Hub Controller Max Current For Bus Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
HC_MAX_C_BP
Hub Controller Max Current Bus-Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a buspowered hub. This value will include the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value will NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
A value of 50 (decimal) would indicate 100mA, which is the default value.
Revision 1.92 (11-28-07)
20
DATASHEET
SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.2.1.17
Register 10h: Power-On Time
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
POWER_ON_TIME
Power On Time: The length of time that it takes (in 2 ms intervals) from the
time the host initiated power-on sequence begins on a port until power is
good on that port.
4.2.1.18
Register F6h: Boost_Up
BIT
NUMBER
BIT NAME
7:2
Reserved
1:0
BOOST_IOUT
DESCRIPTION
Reserved
USB electrical signaling drive strength Boost Bit for the Upstream Port.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (approximately 4% boost)
‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)
‘11’ = Elevated electrical drive strength = High (approximately 12% boost)
Note:
4.2.1.19
“Boost” could result in non-USB Compliant parameters (one
example would be Test J/K levels), the OEM should use a 00 value
unless specific implementation issues require additional signal
boosting to correct for degraded USB signalling levels.
Register F8h: Boost_2:0
BIT
NUMBER
BIT NAME
7:4
Reserved
3:2
BOOST_IOUT_2
DESCRIPTION
Reserved
USB electrical signaling drive strength Boost Bit for Downstream Port ‘2’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (approximately 4% boost)
‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)
‘11’ = Elevated electrical drive strength = High (approximately 12% boost)
Note:
1:0
BOOST_IOUT_1
“Boost” could result in non-USB Compliant parameters (one
example would be Test J/K levels), the OEM should use a 00 value
unless specific implementation issues require additional signal
boosting to correct for degraded USB signalling levels.
USB electrical signaling drive strength Boost Bit for Downstream Port ‘1’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (approximately 4% boost)
‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)
‘11’ = Elevated electrical drive strength = High (approximately 12% boost)
Note:
SMSC USB2512
“Boost” could result in non-USB Compliant parameters (one
example would be Test J/K levels), the OEM should use a 00 value
unless specific implementation issues require additional signal
boosting to correct for degraded USB signalling levels.
21
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.2.1.20
Register FAh: Port Swap
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PRTSP
Port Swap: Swaps the Upstream and Downstream USB DP and DM Pins for
ease of board routing to devices and connectors.
‘0’ = USB D+ functionality is associated with the DP pin and D- functionality
is associated with the DM pin.
‘1’ = USB D+ functionality is associated with the DM pin and D- functionality
is associated with the DP pin.
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Revision 1.92 (11-28-07)
7=
6=
5=
4=
3=
2=
1=
0=
Reserved
Reserved
Reserved
Reserved
Reserved
‘1’; Port 2 DP/DM is Swapped.
‘1’: Port 1 DP/DM is Swapped.
‘1’:Upstream Port DP/DM is Swapped
22
DATASHEET
SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.2.1.21
Register FBh: Port Remap 12
BIT
NUMBER
BIT NAME
7:0
PRTR12
DESCRIPTION
Port remap register for ports 1 & 2.
When a hub is enumerated by a USB Host Controller, the hub is only
permitted to report how many ports it has; the hub is not permitted to select
a numerical range or assignment. The Host Controller will number the
downstream ports of the hub starting with the number '1', up to the number
of ports that the hub reported having.
The host's port number is referred to as "Logical Port Number" and the
physical port on the hub is the “Physical Port Number". When remapping
mode is enabled (see PRTMAP_EN in Register 08h: Configuration Data
Byte 3) the hub's downstream port numbers can be remapped to different
logical port numbers (assigned by the host).
Note:
The OEM must ensure that Contiguous Logical Port Numbers are
used, starting from #1 up to the maximum number of enabled ports;
this ensures that the hub's ports are numbered in accordance with
the way a Host will communicate with the ports.
Table 4.2 Port Remap Register for Ports 1 & 2
Bit [7:4]
Bit [3:0]
SMSC USB2512
23
‘0000’
Physical Port 2 is Disabled
‘0001’
Physical Port 2 is mapped to Logical Port 1
‘0010’
Physical Port 2 is mapped to Logical Port 2
‘0011’
to
‘1111’
Illegal; Do Not Use
‘0000’
Physical Port 1 is Disabled
‘0001’
Physical Port 1 is mapped to Logical Port 1
‘0010’
Physical Port 1 is mapped to Logical Port 2
‘0011’
to
‘1111’
Illegal; Do Not Use
DATASHEET
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USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.2.1.22
Register FFh: Status/Command
BIT
NUMBER
BIT NAME
7:3
Reserved
2
INTF_PW_DN
DESCRIPTION
Reserved
SMBus Interface Power Down
‘0’ = Interface is active
‘1’ = Interface power down after ACk has completed
1
RESET
Reset the SMBus Interface and internal memory back to RESET_N
assertion default settings.
‘0’ = Normal Run/Idle State
‘1’ = Force a reset of registers to their default state
0
USB_ATTACH
USB Attach (and write protect)
‘0’ = SMBus slave interface is active
‘1’ = Hub will signal a USB attach event to an upstream device, and the
internal memory (address range 00h-FEh) is “write-protected” to prevent
unintentional data corruption.
4.2.2
I2C EEPROM
The I2C EEPROM interface implements a subset of the I2C Master Specification (Please refer to the
Philips Semiconductor Standard I2C-Bus Specification for details on I2C bus protocols). The Hub’s I2C
EEPROM interface is designed to attach to a single “dedicated” I2C EEPROM, and it conforms to the
Standard-mode I2C Specification (100kbit/s transfer rate and 7-bit addressing) for protocol and
electrical compatibility.
Note: Extensions to the I2C Specification are not supported.
The Hub acts as the master and generates the serial clock SCL, controls the bus access (determines
which device acts as the transmitter and which device acts as the receiver), and generates the START
and STOP conditions.
4.2.2.1
Implementation Characteristics
The Hub will only access an EEPROM using the Sequential Read Protocol.
4.2.2.2
Pull-Up Resistor
The Circuit board designer is required to place external pull-up resistors (10KΩ recommended) on the
SDA/SMBDATA & SCL/SMBCLK/CFG_SELO lines (per SMBus 1.0 Specification, and EEPROM
manufacturer guidelines) to Vcc in order to assure proper operation.
4.2.2.3
I2C EEPROM Slave Address
Slave address is 1010000.
Note: 10-bit addressing is NOT supported.
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USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.2.3
In-Circuit EEPROM Programming
The EEPROM can be programmed via ATE by pulling RESET_N low (which tri-states the Hub’s
EEPROM interface and allows an external source to program the EEPROM).
4.3
SMBus Slave Interface
Instead of loading User-Defined Descriptor data from an external EEPROM, the SMSC Hub can be
configured to receive a code load from an external processor via an SMBus interface. The SMBus
interface shares the same pins as the EEPROM interface; if CFG_SEL1 & CFG_SEL0 activates the
SMBus interface, external EEPROM support is no longer available (and the user-defined descriptor
data must be downloaded via the SMBus). Due to system issues, the SMSC Hub waits indefinitely for
the SMBus code load to complete and only “appears” as a newly connected device on USB after the
code load is complete.
The Hub’s SMBus implementation is a subset of the SMBus interface to the host. The device is a
slave-only SMBus device. The implementation in the device is a subset of SMBus since it only supports
two protocols.
The Write Block and Read Block protocols are the only valid SMBus protocols for the Hub. The Hub
responds to other protocols as described in Section 4.3.2, "Invalid Protocol Response Behavior," on
page 26. Reference the System Management Bus Specification, Rev 1.0.
The SMBus interface is used to read and write the registers in the device. The register set is shown
in Section 4.2.1, "Internal Register Set (Common to EEPROM and SMBus)," on page 13.
4.3.1
Bus Protocols
Typical Write Block and Read Block protocols are shown below. Register accesses are performed
using 7-bit slave addressing, an 8-bit register address field, and an 8-bit data field. The shading
indicates the Hub driving data on the SMBDATA line; otherwise, host data is on the SDA/SMBDATA
line.
The slave address is the unique SMBus Interface Address for the Hub that identifies it on SMBus. The
register address field is the internal address of the register to be accessed. The register data field is
the data that the host is attempting to write to the register or the contents of the register that the host
is attempting to read.
Note: Data bytes are transferred MSB first (msb first).
4.3.1.1
Block Read/Write
The Block Write begins with a slave address and a write condition. After the command code, the host
issues a byte count which describes how many more bytes will follow in the message. If a slave had
20 bytes to send, the first byte would be the number 20 (14h), followed by the 20 bytes of data. The
byte count may not be 0. A Block Read or Write is allowed to transfer a maximum of 32 data bytes.
Note: For the following SMBus tables:
D e n o te s M a s te r-to -S la v e
SMSC USB2512
D e n o te s S la v e -to -M a s te r
25
DATASHEET
Revision 1.92 (11-28-07)
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
1
7
1
1
S
Slave Address
Wr
A
8
1
Register Address
A
...
8
1
8
1
8
1
8
1
1
Byte Count = N
A
Data byte 1
A
Data byte 2
A
Data byte N
A
P
Block Write
Figure 4.1 Block Write
Block Read
A Block Read differs from a block write in that the repeated start condition exists to satisfy the I2C
specification’s requirement for a change in the transfer direction.
1
S
7
Slave Address
1
1
8
1
1
7
1
1
Wr
A
Register Address
A
S
Slave Address
Rd
A
...
8
1
8
1
8
1
8
1
1
Byte Count = N
A
Data byte 1
A
Data byte 2
A
Data byte N
A
P
Block Read
Figure 4.2 Block Read
4.3.2
Invalid Protocol Response Behavior
Registers that are accessed with an invalid protocol are not updated. A register is only updated
following a valid protocol. The only valid protocols are Write Block and Read Block, which are
described above.
The Hub only responds to the hardware selected Slave Address.
Attempting to communicate with the Hub over SMBus with an invalid slave address or invalid protocol
results in no response, and the SMBus Slave Interface returns to the idle state.
The only valid registers that are accessible by the SMBus slave address are the registers defined in
the Registers Section. See Section 4.3.3 for the response to undefined registers.
4.3.3
General Call Address Response
The Hub does not respond to a general call address of 0000_000b.
4.3.4
Slave Device Time-Out
According to the SMBus Specification, V1.0 devices in a transfer can abort the transfer in progress
and release the bus when any single clock low interval exceeds 25ms (TTIMEOUT, MIN). Devices that
have detected this condition must reset their communication and be able to receive a new START
condition no later than 35ms (TTIMEOUT, MAX).
Note: Some simple devices do not contain a clock low drive circuit; this simple kind of device typically
resets its communications port after a start or stop condition. The Slave Device Time-Out must
be implemented.
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SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.3.5
Stretching the SCLK Signal
The Hub supports stretching of the SCLK by other devices on the SMBus. The Hub does not stretch
the SCLK.
4.3.6
SMBus Timing
The SMBus Slave Interface complies with the SMBus AC Timing Specification. See the SMBus timing
in the “Timing Diagram” section.
4.3.7
Bus Reset Sequence
The SMBus Slave Interface resets and returns to the idle state upon a START field followed
immediately by a STOP field.
4.3.8
SMBus Alert Response Address
The SMBALERT# signal is not supported by the Hub.
4.3.8.1
Undefined Registers
The registers shown in Table 4.1 are the defined registers in the Hub. Reads to undefined registers
return 00h. Writes to undefined registers have no effect and do not return an error.
4.3.8.2
Reserved Registers
Unless otherwise instructed, only a ‘0’ may be written to all reserved registers or bits.
4.4
Default Configuration Option:
The SMSC Hub can be configured via its internal default configuration. (please see Section 4.2.1,
"Internal Register Set (Common to EEPROM and SMBus)" for specific details on how to enable default
configuration.)
Please refer to Table 4.1 for the internal default values that are loaded when this option is selected.
4.5
Default Strapping Options:
The USB2512 can be configured via a combination of internal default values and pin strap options.
Please see Table 3.1 and Table 3.2 for specific details on how to enable the default/pin-strap
configuration option.
The strapping option pins only cover a limited sub-set of the configuration options. The internal default
values will be used for the bits & registers that are not controlled by a strapping option pin. Please
refer to Table 4.1 for the internal default values that are loaded when this option is selected.
4.6
Reset
There are two different resets that the Hub experiences. One is a hardware reset (either from the
internal POR reset circuit or via the RESET_N pin) and the second is a USB Bus Reset.
4.6.1
Internal POR Hardware Reset
All reset timing parameters are guaranteed by design.
SMSC USB2512
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USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
4.6.2
External Hardware RESET_N
A valid hardware reset is defined as assertion of RESET_N for a minimum of 1us after all power
supplies are within operating range. While reset is asserted, the Hub (and its associated external
circuitry) consumes less than 500μA of current from the upstream USB power source.
Assertion of RESET_N (external pin) causes the following:
1. All downstream ports are disabled, and PRTPWR power to downstream devices is removed.
2. The PHYs are disabled, and the differential pairs will be in a high-impedance state.
3. All transactions immediately terminate; no states are saved.
4. All internal registers return to the default state (in most cases, 00(h)).
5. The external crystal oscillator is halted.
6. The PLL is halted.
The Hub is “operational” 500μs after RESET_N is negated.
Once operational, the Hub immediately reads OEM-specific data from the external EEPROM (if the
SMBus option is not disabled).
4.6.2.1
RESET_N for Strapping Option Configuration
Hardware
reset
asserted
Drive Strap
Outputs to
inactive
levels
Read Strap
Options
t1
Attach
USB
Upstream
USB Reset
recovery
t5
Start
completion
request
response
Idle
t7
t6
t8
t2
t3
RESET_N
VSS
t4
Strap Pins
Don’t Care
Valid
Driven by Hub if strap is an output.
Don’t Care
VSS
Figure 4.3 Reset_N Timing for Default/Strap Option Mode
Table 4.3 Reset_N Timing for Default/Strap Option Mode
NAME
DESCRIPTION
MIN
TYP
MAX
UNITS
1
μsec
Strap Setup Time
16.7
nsec
t3
Strap Hold Time.
16.7
t4
hub outputs driven to inactive logic states
t5
USB Attach (See Note).
t6
Host acknowledges attach and signals USB
Reset.
t1
RESET_N Asserted.
t2
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1.5
100
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1400
nsec
2
μsec
100
msec
msec
SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Table 4.3 Reset_N Timing for Default/Strap Option Mode (continued)
NAME
DESCRIPTION
MIN
t7
USB Idle.
t8
Completion time for requests (with or without data
stage).
TYP
MAX
UNITS
undefined
msec
5
msec
Notes:
4.6.2.2
When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than
100mA from the upstream USB power source during t1+t5.
All Power Supplies must have reached the operating levels mandated in Chapter 5, DC
Parameters, prior to (or coincident with) the assertion of RESET_N.
RESET_N for EEPROM Configuration
Hardware
reset
asserted
Attach
USB
Upstream
Read EEPROM
+
Set Options
Read Strap
Options
USB Reset
recovery
Start
completion
request
response
Idle
t4
t1
t2
t5
t3
t6
t7
RESET_N
VSS
Figure 4.4 Reset_N Timing for EEPROM Mode
Table 4.4 Reset_N Timing for EEPROM Mode
NAME
DESCRIPTION
MIN
t1
RESET_N Asserted.
t2
Hub Recovery/Stabilization.
t3
EEPROM Read / Hub Config.
t4
USB Attach (See Note).
t5
Host acknowledges attach and signals USB
Reset.
t6
USB Idle.
t7
Completion time for requests (with or without data
stage).
TYP
MAX
UNITS
μsec
1
2.0
500
μsec
99.5
msec
100
msec
100
msec
undefined
msec
5
msec
Notes:
When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than
100mA from the upstream USB power source during t4+t5+t6+t7.
All Power Supplies must have reached the operating levels mandated in Chapter 5, DC
Parameters, prior to (or coincident with) the assertion of RESET_N.
SMSC USB2512
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USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
RESET_N for SMBus Slave Configuration
4.6.2.3
Hardware
reset
asserted
Reset
Negation
SMBus Code
Load
t1
t2
Hub PHY
Stabilization
Attach
USB
Upstream
t3
t4
USB Reset
recovery
Start
completion
request
response
Idle
t6
t5
t7
RESET_N
VSS
Figure 4.5 Reset_N Timing for SMBus Mode
Table 4.5 Reset_N Timing for SMBus Mode
NAME
DESCRIPTION
MIN
t1
RESET_N Asserted.
t2
Hub Recovery/Stabilization.
t3
SMBus Code Load (See Note).
t4
Hub Configuration and USB Attach.
t5
Host acknowledges attach and signals USB
Reset.
t6
USB Idle.
t7
Completion time for requests (with or without data
stage).
TYP
MAX
UNITS
μsec
1
250
500
μsec
300
msec
100
msec
100
msec
Undefined
msec
5
msec
Notes:
4.6.3
For Bus-Powered configurations, the 99.5ms (MAX) is required, and the Hub and its associated
circuitry must not consume more than 100mA from the upstream USB power source during
t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load
the configuration is determined by the external SMBus host.
All Power Supplies must have reached the operating levels mandated in Chapter 5, DC
Parameters, prior to (or coincident with) the assertion of RESET_N.
USB Bus Reset
In response to the upstream port signaling a reset to the Hub, the Hub does the following:
Note: The Hub does not propagate the upstream USB reset to downstream devices.
1. Sets default address to 0.
2. Sets configuration to: Unconfigured.
3. Negates PRTPWR[2:1] to all downstream ports.
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Datasheet
4. Clears all TT buffers.
5. Moves device from suspended to active (if suspended).
6. Complies with Section 11.10 of the USB 2.0 Specification for behavior after completion of the reset
sequence.
The Host then configures the Hub and the Hub’s downstream port devices in accordance with the USB
Specification.
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USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Chapter 5 DC Parameters
5.1
Maximum Guaranteed Ratings
PARAMETER
SYMBOL
MIN
MAX
UNITS
Storage
Temperature
TA
-55
150
°C
325
°C
Lead
Temperature
1.8V supply
voltage
VDDA18PLL,
VDD18
2.5
V
3.3V supply
voltage
VDDA33,
VDD33PLL,
VDD33,
VDD33CR
4.6
V
Voltage on any
I/O pin
-0.5
5.5
V
Voltage on
XTAL1
-0.5
4.0
V
Voltage on
XTAL2
-0.5
3.6
V
COMMENTS
Soldering < 10 seconds
Note: Stresses above the specified parameters could cause permanent damage to the device. This
is a stress rating only and functional operation of the device at any condition above those
indicated in the operation sections of this specification is not implied. When powering this
device from laboratory or system power supplies, it is important that the Absolute Maximum
Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage
spikes on their outputs when the AC power is switched on or off. In addition, voltage transients
on the AC power line may appear on the DC output. When this possibility exists, it is suggested
that a clamp circuit be used.
5.2
Recommended Operating Conditions
PARAMETER
SYMBOL
MIN
MAX
UNITS
Operating
Temperature
TA
0
70
°C
1.8V supply voltage
VDDA18PLL
VDD18
1.62
1.98
V
3.3V supply voltage
VDDA33
VDDA33PLL
VDD33
VDD33CR
3.0
3.6
V
-0.3
5.5
V
Voltage on any I/O pin
COMMENTS
If any 3.3V supply voltage drops
b e l o w 3 . 0 V, t h e n t h e M A X
becomes:
(3.3V supply voltage) + 0.5
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USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
PARAMETER
SYMBOL
MIN
MAX
UNITS
Voltage on XTAL1
-0.3
VDDA33
V
Voltage on XTAL2
-0.3
VDD18
V
COMMENTS
Table 5.1 DC Electrical Characteristics
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
0.8
V
COMMENTS
I, IS Type Input Buffer
Low Input Level
VILI
High Input Level
VIHI
2.0
IIL
-10
+10
uA
VHYSI
250
350
mV
0.8
V
Input Leakage
Hysteresis (‘IS’ Only)
TTL Levels
V
VIN = 0 to VDD33
Input Buffer with Pull-Up
(IPU)
Low Input Level
VILI
TTL Levels
High Input Level
VIHI
2.0
Low Input Leakage
IILL
+35
+90
uA
VIN = 0
High Input Leakage
IIHL
-10
+10
uA
VIN = VDD33
0.8
V
TTL Levels
V
Input Buffer with PullDown (IPD)
Low Input Level
VILI
High Input Level
VIHI
2.0
Low Input Leakage
IILL
+10
-10
uA
VIN = 0
High Input Leakage
IIHL
-35
-90
uA
VIN = VDD33
0.5
V
V
ICLK Input Buffer
Low Input Level
VILCK
High Input Level
VIHCK
1.4
IIL
-10
Input Leakage
V
+10
uA
0.4
V
IOL = 12mA @ VDD33 = 3.3V
V
IOH = -12mA @ VDD33 = 3.3V
VIN = 0 to VDD33
(Note 1)
VIN = 0 to VDD33
O12, I/O12 &I/OSD12
Type Buffer
Low Output Level
VOL
High Output Level
VOH
2.4
Output Leakage
IOL
-10
+10
uA
VHYSC
250
350
mV
Hysteresis (‘SD’ pad only)
IO-U
(Note 2)
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SMSC USB2512
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Table 5.1 DC Electrical Characteristics (continued)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
90
80
95
85
mA
mA
COMMENTS
Supply Current
Unconfigured
High-Speed Host
Full-Speed Host
ICCINTHS
ICCINITFS
Supply Current
Configured
(High-Speed Host)
1 Port HS, 1 Port LS/FS
2 Ports @ LS/FS
2 Ports @ HS
All supplies combined
IHCH1C1
IHCC2
IHCH2
130
120
135
145
140
200
mA
mA
mA
Supply Current
Configured
(Full-Speed Host)
All supplies combined
1 Port
2 Ports
IFCC1
IFCC2
105
105
125
125
mA
mA
Supply Current
Suspend
ICSBY
310
420
μA
All supplies combined
Supply Current
Reset
ICRST
105
250
μA
All supplies combined
Notes:
1. Output leakage is measured with the current pins in high impedance.
2. See USB 2.0 Specification for USB DC electrical characteristics.
SMSC USB2512
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USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
CAPACITANCE TA = 25°C; fc = 1MHz; VDD18, VDDPLL = 1.8V
Table 5.2 Pin Capacitance
LIMITS
PARAMETER
Clock Input
Capacitance
Input Capacitance
Output Capacitance
Revision 1.92 (11-28-07)
SYMBOL
MIN
TYP
MAX
UNIT
TEST CONDITION
CXTAL
2
pF
All pins except USB pins (and pins under
test tied to AC ground)
CIN
10
pF
COUT
20
pF
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USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Chapter 6 AC Specifications
6.1
Oscillator/Clock
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ±350ppm.
External Clock: 50% Duty cycle ± 10%, 24 MHz ± 350ppm, Jitter < 100ps rms.
XTAL1
(C S1 =
C B + C XTAL )
C1
Crystal
1Meg
CL
C2
XTAL2
(C S2 =
C B + C XTAL )
Figure 6.1 Typical Crystal Circuit
Note: CB equals total board/trace capacitance.
(C1 + CS1) x (C2 + CS2)
= CL
(C1 + CS1 + C2 + CS2)
Figure 6.2 Formula to find value of C1 and C2
6.1.1
SMBus Interface:
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the SMBus 1.0 Specification for Slave-Only devices (except as noted in Section 4.3).
6.1.2
I2C EEPROM:
Frequency is fixed at 58.6KHz ± 20%.
6.1.3
USB 2.0
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the USB 2.0 Specification. Please refer to the USB 2.0 Specification for more information.
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Revision 1.92 (11-28-07)
Figure 7.1 36-Pin QFN, 6x6mm Body, 0.5mm Pitch
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Chapter 7 Package Outline
Source Exif Data:
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