Xlx_s9_lx9_fpga_microboard Ug110311x Xilinx Spartan 6 LX9 Micro Board Rev B2 Hardware User Guide

User Manual:

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Xilinx

Spartan

-6 FPGA LX9

MicroBoard

User Guide

Avnet Electronics Marketing 2 of 19 Rev C 11/08/2011

Table of Contents

1.0

Introduction ............................................................................................................................................................................... 4

1.1

Description ............................................................................................................................................................................ 4

1.2

Board Features ..................................................................................................................................................................... 4

1.3

Reference Designs ............................................................................................................................................................... 5

1.4

Ordering Information ............................................................................................................................................................. 5

2.0

Functional Description .............................................................................................................................................................. 6

2.1

Xilinx Spartan-6 FPGA LX9 FPGA ....................................................................................................................................... 6

2.2

Clocks ................................................................................................................................................................................... 8

2.2.1

Triple Output User programmable Texas Instruments CDCE913 clock ........................................................................... 8

2.2.2

Optional 66.6 MHz Maxim low-cost, fixed-frequency oscillator ........................................................................................ 8

2.3

Memory................................................................................................................................................................................. 8

2.3.1

32 Mb x 16 (512 Mb) Micron LPDDR Mobile SDRAM component ................................................................................... 9

2.3.2

128 Mb Micron Multi-I/O SPI Flash ................................................................................................................................ 10

2.4

Communication ................................................................................................................................................................... 11

2.4.1

Universal Serial Bus (USB) 2.0, Full Speed USB-to-JTAG bridge via Atmel AT90USB162 / ATMEGA162U2 AVR

Microcontroller and Tyco USB-A connector ................................................................................................................................ 11

2.4.2

USB-UART ..................................................................................................................................................................... 11

2.4.3

10/100 Ethernet PHY via National Semiconductor DP83848J PHY and Tyco RJ45 connector ..................................... 12

2.5

User I/O and Expansion Connectors .................................................................................................................................. 13

2.5.1

Peripheral Module (PMOD) ............................................................................................................................................ 13

2.6

User Interfaces ................................................................................................................................................................... 14

2.6.1

User LEDs ...................................................................................................................................................................... 14

2.6.2

Four configurable FPGA user DIP switches (Tyco 1571983-4) ...................................................................................... 14

2.6.3

One configurable FPGA user push-button (Tyco 8-1437565-0) ..................................................................................... 14

2.7

Power ................................................................................................................................................................................. 14

2.7.1

Power Good LED ........................................................................................................................................................... 15

2.7.2

FPGA Decoupling .......................................................................................................................................................... 15

2.7.3

Power Results ................................................................................................................................................................ 16

2.8

Configuration ...................................................................................................................................................................... 16

2.8.1

Configuration Modes ...................................................................................................................................................... 17

2.8.2

Digilent On-board JTAG Boundary Scan Configuration ................................................................................................. 17

2.8.3

Multi-I/O SPI Flash Configuration ................................................................................................................................... 17

2.8.4

JTAG Chain .................................................................................................................................................................... 17

3.0

Test Design ............................................................................................................................................................................. 18

4.0

Acknowledgements ................................................................................................................................................................. 18

5.0

Getting Help and Support ....................................................................................................................................................... 18

6.0

Document Revision Table ....................................................................................................................................................... 19

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Figures

Figure 1 – Spartan-6 FPGA LX9 MicroBoard Front .................................................................................................................................... 5

Figure 2 – Spartan-6 FPGA LX9 MicroBoard Back .................................................................................................................................... 5

Figure 3 – Spartan-6 FPGA LX9 MicroBoard Block Diagram ..................................................................................................................... 6

Figure 4 – XC6SLX9 CSG324 I/O Allocation .............................................................................................................................................. 7

Figure 5 – Spartan-6 FPGA LX9 MicroBoard Memory Interfaces ............................................................................................................... 9

Figure 6 – Spartan-6 FPGA LX9 LPDDR Mobile SDRAM Interface ........................................................................................................... 9

Figure 7 – 10/100 Ethernet Interface ........................................................................................................................................................ 12

Figure 8 – PMOD Connector Pinout ......................................................................................................................................................... 15

Figure 9 – TPS65708 Connections .......................................................................................................................................................... 15

Figure 10 – Xilinx Ribbon Cable JTAG Connector ................................................................................................................................... 17

Tables

Table 1 – CDCE913 Clocks ........................................................................................................................................................................ 8

Table 2 – CDCE913 I2C ............................................................................................................................................................................. 8

Table 3 – 66 MHz Clock ............................................................................................................................................................................. 8

Table 4 – LPDDR Timing Parameters ...................................................................................................................................................... 10

Table 5 – FPGA SPI Interface Pinout ....................................................................................................................................................... 10

Table 6 – USB-JTAG Signals ................................................................................................................................................................... 11

Table 7 – USB-to-UART Pin Locations..................................................................................................................................................... 12

Table 8 – 10/100 Pin Assignments ........................................................................................................................................................... 12

Table 9 – Peripheral Module Connections – J4 ........................................................................................................................................ 13

Table 10 – Peripheral Module Connections – J5 ...................................................................................................................................... 13

Table 11 – LED Pin Assignments ............................................................................................................................................................. 14

Table 12 – FPGA DIP Switches ............................................................................................................................................................... 14

Table 13 – FPGA Push-Button ................................................................................................................................................................. 14

Table 14 – S6LX9 MicroBoard Capacitors for XC6SLX9-CSG324 ........................................................................................................... 16

Table 15 – S6LX9 Board Capacitor Quantities for XC6SLX9-CSG324 .................................................................................................... 16

1.0 Introduction

The purpose of this manual is to describe the functionality and contents of the Avnet Spartan-6 FPGA LX9 MicroBoard from Avnet

Electronics Marketing. This document includes instructions for operating the board, descriptions of the hardware features, and

explanations of the test code programmed into the on-board programmable memory. For reference design documentation and

example projects, see the Avnet Design Resource Center (DRC).

DRC Home Page: www.em.avnet.com/drc

Spartan-6 FPGA LX9 MicroBoard Kit Home Page www.em.avnet.com/s6microboard

1.1 Description

The Spartan-6 FPGA LX9 MicroBoard provides a complete hardware environment for designers to accelerate their time to market.

The kit delivers a stable platform to develop and test designs targeted to the low-cost and low-power Xilinx Spartan-6 FPGA. The

installed Spartan-6 FPGA LX9 device offers a prototyping environment to effectively demonstrate the enhanced benefits of low-

cost Xilinx FPGA solutions. Reference designs are included with the kit to exercise standard peripherals on the evaluation board

for a quick start to device familiarization.

The Spartan-6 FPGA LX9 MicroBoard kit contains the following individual pieces:

• Avnet Spartan-6 FPGA LX9 MicroBoard

• Type A male to Type A female USB extension cable

• Type A to Micro-B USB cable

• Xilinx ISE® Design Suite (IDS) 12.4 DVD WebPACK edition

• ChipScope™ Pro and SDK license voucher (device-locked to XC6SLX9)

• Welcome Letter

• Getting Started Guide

Please note that this kit does NOT include a 10/100 Ethernet cable.

1.2 Board Features

• FPGA

o Xilinx Spartan-6 XC6SLX9-2CSG324C FPGA

• Clocks

o Triple output, user programmable, Texas Instruments CDCE913 clock

o Optional user installable Maxim DS1088LU-66+, low-cost, fixed-frequency oscillator

• Memory

o 32 Mb x 16 (512 Mb) Micron LPDDR Mobile SDRAM component.

o 128 Mb Micron Multi-I/O SPI Flash

• Communication

o One USB 2.0, Full Speed USB-to- JTAG bridge via Atmel AT90USB162 / ATMEGA162U2, Digilent JTAG firmware,

and Tyco USB-A connector

o One USB 2.0, Full Speed USB-to-UART bridge via Silicon Labs CP2102 and Tyco Micro-B connector.

o One 10/100 Ethernet port via National Semiconductor DP83848J PHY and Tyco RJ45 connector with Integrated

Magnetics.

• User I/O and Expansion Connectors

o Two Digilent 12-pin, 0.245mm pitch, Peripheral Module (PMOD) headers support 3rd party expansion modules.

• User Interfaces

o Four user LEDs

o Four configurable FPGA user DIP switches

o Two system push-button switches: one tied to user I/O and used for logical reset in the factory test image, one

hardwired for FPGA program initialization.

• Power

o Texas Instruments TPS65708 PMU multi-channel regulator, with 5V input supplied by either USB connection.

• Configuration

o 128Mb SPI Configuration Flash

o On-board USB Programming/Configuration based on the Digilent USB Full Speed JTAG design utilizing the Atmel

AT90USB162 / ATMEGA162U2.

o Xilinx Compatible JTAG Cable

• Test Files

o Files that are used to factory test the Spartan-6 FPGA LX9 MicroBoard are available and can be found on the Avnet

Electronics Marketing Design Resource Center (DRC) web site: www.em.avnet.com/s6microboard.

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1.3 Reference Designs

Reference designs that demonstrate some of the potential applications of the Spartan-6 FPGA LX9 MicroBoard are available and

can be found on the Avnet Electronics Marketing Design Resource Center (DRC) web site: www.em.avnet.com/s6microboard.

See the PDF document included with each reference design for a complete description of the design and detailed instructions for

running a demonstration on the development board. Check the DRC periodically for updates and new designs. The Expanded

Getting Started Guide, available for download from the DRC, is the best place to start.

Figure 1 – Spartan-6 FPGA LX9 MicroBoard Front

Figure 2 – Spartan-6 FPGA LX9 MicroBoard Back

1.4 Ordering Information

The following table lists the evaluation kit part numbers and available software options.

Internet link at http://www.em.avnet.com/drc

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Part Number Hardware

AES-S6MB-LX9-G Xilinx Spartan-6 FPGA LX9 MicroBoard

HW-USB-II-G Xilinx Platform Cable USB-II

JTAG HS1 HIGH SPEED CABLE Digilent HS1 JTAG Cable

EF-EDK-NL EDK Upgrade for ISE WebPack

EF-ISE-EMBD-NL ISE Embedded Edition

EF-ISE-SYSTEM-NL ISE System Edition

2.0 Functional Description

A Xilinx Spartan-6 FPGA LX9 (XC6SLX9-2CSG324) FPGA is the primary components of the Avnet Spartan-6 FPGA LX9 MicroBoard.

A 10/100 Ethernet port and 2 Full Speed USB interfaces provide means of off-board communication. On-board memory consists of a

256 Mbit x 16 LPDDR mobile SDRAM component and a 128 Mbit Multi-I/O SPI Flash that may be used by the FPGA for configuration.

A high-level block diagram of the Spartan-6 FPGA LX9 MicroBoard is shown below followed by a brief description of each sub-section.

Figure 3 – Spartan-6 FPGA LX9 MicroBoard Block Diagram

2.1 Xilinx Spartan-6 FPGA LX9 FPGA

The Xilinx XC6SLX9-2CSG324C device designed onto the Spartan-6 FPGA LX9 MicroBoard is a member of the logic-optimized

Xilinx Spartan-6 LX FPGA family. This family is built on a mature 45 nm low-power copper process technology that delivers the

optimal balance of cost, power, and performance. The Spartan-6 LX family offers a new, more efficient, dual-register 6-input look-

up table (LUT) logic and a rich selection of built-in system-level blocks. These include 18 Kb (2 x 9 Kb) block RAMs, second

generation DSP48A1 slices, SDRAM memory controllers, enhanced mixed-mode clock management blocks, SelectIO™

technology, advanced system-level power management modes, auto-detect configuration options, and enhanced IP security with

Device DNA protection. These features provide a low-cost programmable alternative to custom ASIC products with unprecedented

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ease-of-use. Spartan-6 FPGAs offer the best solution for high-volume logic designs, consumer-oriented DSP designs, and cost-

sensitive embedded applications.

On the Avnet Spartan-6 FPGA LX9 MicroBoard, the FPGA provides four I/O banks. Banks 0, 1, and 2 Vcco as well as the Vccaux

power rail are tied to 3.3 V. This allows Bank 0 to interface to 3.3 V user I/O, Bank 1 to interface to 3.3 V Ethernet I/O, and Bank 2

to interface to 3.3 V configuration I/O. Bank 3 interfaces to the LPDDR memory and is connected to a 1.8 V power rail for low-

power consumption memory designs. The VCCINT power rail is connected to 1.2 V.

The four I/O banks are described in Figure 4 and detailed I/O pin usage is provided throughout this document.

Figure 4 – XC6SLX9 CSG324 I/O Allocation

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2.2 Clocks

2.2.1 Triple Output User programmable Texas Instruments CDCE913 clock

The CDCE913 is a modular PLL-based low-cost, high-performance, programmable clock synthesizer, multiplier, and divider. It

can generate up to 3 output clocks from a single input frequency. Each output can be programmed via an SDA / SCL, SMBus /

I2C interface, for any clock frequency up to 230 MHz, using the integrated configurable PLL. The input crystal frequency on

the S6LX9 MicroBoard is 27 MHz. The following clock frequency outputs are pre-programmed into the CDCE913 during

factory configuration.

Clock CDCE913 Pin# Signal Name FPGA Pin#

40 MHz U1 pin 11 (Y1) USER_CLOCK V10 (GCLK0)

66.7 MHz U1 pin 9 (Y2) CLOCK_Y2 K15 (GCLK9)

100 MHz U1 pin 8 (Y3) CLOCK_Y3 C10 (GCLK13)

Table 1 – CDCE913 Clocks

The user is able to modify these frequencies using the FPGA’s connection to the CDCE913 I2C port. Internal FPGA pull-ups

are required for this interface to work properly.

Signal Name CDCE913 Pin# FPGA Pin#

SDA U1 pin 13 U13

SCL U1 pin 12 P12

Table 2 – CDCE913 I2C

2.2.2 Optional 66.6 MHz Maxim low-cost, fixed-frequency oscillator

This is an unpopulated Maxim 3.3 V low-cost oscillator, part number DS1088LU-66+.

Clock

Signal Nam

FPGA Pin#

66.7 MHz BACKUP_CLOCK R8 (GCLK31)

Table 3 – 66 MHz Clock

2.3 Memory

The Spartan-6 FPGA LX9 MicroBoard is populated with both LPDDR mobile SDRAM memory (256 Mbit x 16) and 128 Mbit SPI

Multi-I/O Flash to support various types of applications. The SPI Flash may be used for FPGA configuration.

Figure 5 shows a high-level block diagram of the memory interfaces on this board.

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Figure 5 – Spartan-6 FPGA LX9 MicroBoard Memory Interfaces

2.3.1 32 Mb x 16 (512 Mb) Micron LPDDR Mobile SDRAM component

The Micron LPDDR mobile SDRAM device, part number MT46H32M16LFBF-5, provides a double data rate architecture to

achieve high-speed operation. The device provides 64 MB and it is internally configured as a quad-bank DRAM of memory on

a single IC. Each of the x16’s 134,217,728-bit banks is organized as 8,192 rows by 1,024 columns by 16 bits. The device has

an operating voltage of 1.8V and the interface is MOBILE_DDR. The Spartan-6 Memory Controller Block supports up to 400

Mb/s (200 MHz double data rate) performance. The following figure shows a high-level block diagram of the LPDDR Mobile

SDRAM interface on the MicroBoard.

Figure 6 – Spartan-6 FPGA LX9 LPDDR Mobile SDRAM Interface

S6LX9

CSG324

Bank 3

A[12:0]

BA[1:0]

LDQ

UDQ

LDM

UDM

CAS

RAS

WE#

CS#

CKE

CK_P/N

S6LX9

SPI Flash

Digilent 4-Pin Flash

Progrmming

Interface

LPDDR

Mobile SDRAM

DQ[15:0]

A[12:0]

BA[1:0]

LDQS

UDQS

LDM

UDM

CAS#

RAS#

WE#

CS#

CKE

CK_P/N

LPDDR

Mobile SDRAM

DQ[15:0]

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The LPDDR signals are connected to I/O Bank 3 of the Spartan-6 FPGA LX9 FPGA. The voltage supply pins (VCCO) for the

LPDDR bank are connected to the 1.8V supply rail. This supply rail can be measured across the 100uF Capacitor C22.

It is highly recommended that anyone creating a Spartan-6 MCB design thoroughly read the two User Guides (UG388 and

UG416), the MIG Master Answer Record 33566, and the associated Answer Records linked from that Master Record.

The following table provides timing and other information about the Micron device necessary to implement a DDR2 memory

controller.

MT47H16M16BG

5E: Timing Parameters

Time (ps) or Number

Load Mode Register time (TMRD) 2 tCK

Write Recovery time (TWR) 15000

Write-to-Read Command Delay (TWTR) 10000

Delay between ACT and PRE Commands (TRAS) 40000

Delay after ACT before another ACT (TRC) 55000

Delay after AUTOREFRESH Command (TRFC) 75000

Delay after ACT before READ/WRITE (TRCD) 15000

Delay after ACT before another row ACT (TRRD) 10000

Delay after PRECHARGE Command (TRP) 15000

Refresh Command Interval (TREFC) 70000000

Avg. Refresh Period (TREFI) 7800000

Memory Data Width (DWIDTH) (2 devices) 32

Row Address Width (AWIDTH) 13

Column Address Width (COL_AWIDTH) 9

Bank Address Width (BANK_AWIDTH) 2

Memory Range (64 MB total) 0x3FFFFFF

Table 4 – LPDDR Timing Parameters

The layout guidelines for Spartan-6 MCB designs, as detailed in Spartan-6 FPGA Memory Controller, UG388, were followed in

the design of this board. The pinout specified in the Spartan-6 Packaging & Pinout Guide, UG385 for the XC6SLX9-CSG324

was followed.

2.3.2 128 Mb Micron Multi-I/O SPI Flash

The Spartan-6 FPGA LX9 Board includes a Micron Multi-I/O SPI Flash memory, part number N25Q128. The SPI Flash is

connected to the FPGA to support Quad-I/O (QIO), Dual-I/O (DIO), or Single-I/O (SIO) SPI configuration.

The SPI signals are also connected to the Atmel AT90USB162 / ATMEGA162U2 SPI interface pins. This interface can be

used to connect to the SPI flash via the AT90USB162 / ATMEGA162U2 USB and allows for direct Flash programming using a

Digilent provided utility

Signal N25Q128

Pin# FPGA

Pin#

AT90USB162

ATMEGA162U2

Pin#

FPGA_MOSI_MOSO0 (MOSI (DQ0)) U2 pin 5 (DQ0) T13 U3 pin 9

FPGA_D0_DIN_MISO_MISO1 (MISO (DQ1)) U2 pin 2 (DQ1) R13 U3 pin 8

FPGA_D1_MISO2 (W#/VPP (DQ2)) U2 pin 3 (DQ2) T14 NC

FPGA_D2_MISO3 (HOLD#(DQ3)) U2 pin 7 (DQ3) V14 NC

FPGA_CCLK (CLK) U2 pin 6 (C) R15 U3 pin 11

FPGA_SPI CS# (SEL) U2 pin 1 (S_N) V3 U3 pin 10

FPGA_PROG (PROGRAM_B) NC V2 U3 pin 19

Table 5 – FPGA SPI Interface Pinout

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The SPI Flash is connected to Spartan-6 Bank 2, which has a Vcco of 3.3 V, which can be measured across the 100 uF

capacitor C23.

The SPI Flash can be programmed in the following ways:

• Use the Digilent sfutil.exe command line application to program the Flash directly through the AT90USB162 /

ATMEGA162U2. Please see the Spartan-6_LX9_MicroBoard_Configuration_Guide located at

http://www.em.avnet.com/s6microboard for an application note on this subject.

• Using Digilent USB via JTAG to program the Flash indirectly using iMPACT 12.1 or later with the Digilent Plug-in.

• Using Platform Cable USB via JTAG to program the Flash indirectly using iMPACT 12.1 or later.

Please note that the following patch may be required to build a MicroBlaze Hardware Platform that includes the XPS_SPI

peripheral: http://www.xilinx.com/support/answers/39017.htm

2.4 Communication

2.4.1 Universal Serial Bus (USB) 2.0, Full Speed USB-to-JTAG bridge via Atmel AT90USB162 / ATMEGA162U2 AVR

Microcontroller and Tyco USB-A connector

P1 is a Tyco USB-A board-mount connector. P1 connects to a full-speed (12 Mbps) USB peripheral port on the AT90USB162 /

ATMEGA162U2 device. Power supplied by the USB host via connector P1 (+5V_USB_A) is used in conjunction with power from

the other USB port, through diodes D13 and D16 to power the S6LX9 board.

The AT90USB162 / ATMEGA162U2 is used in the bridge configuration to allow FPGA configuration via the Digilent JTAG

interface, and in the SPI configuration to allow SPI Flash programming via the Digilent program controlled SPI interface. Operation

in the JTAG configuration is accomplished using iMPACT and the Digilent Plug-in. Please see the Spartan-

6_LX9_MicroBoard_Configuration_Guide located at http://www.em.avnet.com/s6microboard for an application note on this

subject.

Note that an additional Xilinx Platform Cable connector is provided (J6), for JTAG operation. Operation in the SPI configuration is

accomplished using the command line sfutil.exe. Both configurations make use of custom Digilent firmware loaded into the

AT90USB162 / ATMEGA162U2 device during manufacture. Note the SPI Flash Interface Pinout is shown in Table 5. The JTAG

Interface Pinout is shown in Table 6.

Signal Xilinx Parallel IV

Pin# FPGA

Pin# AT90USB162 /

ATMEGA162U2 Pin#

FPGA_TCK J6 pin 6 (TCK) A17 (TCK) U3 pin 15 (SCLK)

FPGA_TMS J6 pin 4 (TMS) B18 (TMS) U3 pin 14 (SS_N)

FPGA_TDO J6 pin 8 (TDO) D16 (TDO) U3 pin 17 (MISO)

FPGA_TDI J6 pin 10 (TDI) D15 (TDI) U3 pin 16 (MOSI)

FPGA_PROG NC V2 (PROGRAM_B) U3 pin 19 (PB5)

Table 6 – USB-JTAG Signals

2.4.2 USB-UART

The Spartan-6 FPGA LX9 MicroBoard implements a Silicon Labs CP2102 device that provides a USB-to-UART bridge. The

USB physical interface is brought out on a Tyco USB micro-B connector labeled “J3.” Power supplied by the USB host via

connector J3 (+5V_USB_B) is used in conjunction with power from the other USB port, through diodes D13 and D16 to power

the S6LX9 board.

Please see the Avnet DRC for an application note describing the driver installation and usage of this device.

The USB-to-UART bridge interface connects to the Spartan-6 FPGA through the following pins:

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Net Name Spartan-6 Pin #

USB_RS232_RXD R7

USB_RS232_TXD T7

Table 7 – USB-to-UART Pin Locations

2.4.3 10/100 Ethernet PHY via National Semiconductor DP83848J PHY and Tyco RJ45 connector

The PHY device is a National Semiconductor DP83848J. The Tyco RJ45 connector includes integrated magnetics and LEDs.

A MAC must be placed inside the FPGA, such as the XPS Ethernet Lite or Tri-Mode Ethernet Media Access Controller

(TEMAC). These cores are accessible in ISE Embedded or EDK. The TEMAC requires the purchase and installation of a

license.

data

datadata

data_

_tx

txtx

tx[

[[

]]

]

clk

clkclk

clk_

_tx

txtx

control

controlcontrol

control_

_tx

txtx

data

datadata

data_

_rx

rxrx

rx[

[[

]]

]

clk

clkclk

clk _

_rx

rxrx

control

controlcontrol

control_

_rx

rxrx

Crystal

CrystalCrystal

Crystal

2525

25Mhz

MhzMhz

Mhz

1010

10/

/100

100 100

100 PHY

PHYPHY

PHY

6LX

LXLX

LX9

phy

phyphy

phy_

_reset

resetreset

reset

LEDs

LEDsLEDs

LEDs

TDTD

TD _

TDTD

TD _

RDRD

RD_

RDRD

RD _

gtxclk

gtxclkgtxclk

gtxclk

Figure 7 – 10/100 Ethernet Interface

Net Name

FPGA Pin#

FPGA_ETH_MDC M16

FPGA_ETH_MDIO L18

FPGA_ETH_RX_CLK L15

FPGA_ETH_RX_D0 T17

FPGA_ETH_RX_D1 N16

FPGA_ETH_RX_D2 N15

FPGA_ETH_RX_D3 P18

FPGA_ETH_RX_ER N18

FPGA_ETH_DV P17

FPGA_ETH_TX_CLK H17

FPGA_ETH_TX_D0 K18

FPGA_ETH_TX_D1 K17

FPGA_ETH_TX_D2 J18

FPGA_ETH_TX_D3 J16

FPGA_ETH_TX_EN L17

FPGA_ETH_COL M18

FPGA_ETH_CRS N17

FPGA_ETH_RESET# T18

Table 8 – 10/100 Pin Assignments

Please note that the PHY Address pins are not strapped on the board. The Avnet XBD for this board places pull-ups on the

AD[4:1] pins. The AD[0] pin is shared with COL, which gets stripped out of EDK 12.4 xps_ethernetlite full duplex designs. The

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default bitgen options result in this now unused pin getting pulled-low, which results in a PHY Address of 11110b. If the bitgen

options are changed such that UnusedPins are PullNone, then the PHY Address will be 11111b due to the internal PHY pull-

up on AD[0]. The user must be aware that not controlling these PHY AD pins with internal pull-up and bitgen options will result

in a PHY Address of 00000b, which puts the PHY into Isolate Mode, and it will not operate correctly.

2.5 User I/O and Expansion Connectors

2.5.1 Peripheral Module (PMOD)

Two 12-pin (2 x 6 female) Peripheral Module (PMOD) headers (J4, J5) are interfaced to the FPGA, with each header providing

3.3 V power, ground, and eight I/O’s. These headers may be utilized as general-purpose I/Os or may be used to interface to

PMODs. J4 and J5 are placed in close proximity (0.9”-centers) on the PCB in order to support dual PMODs. Table 9 and Table

10 provide the connector and FPGA pinout. For Digilent PMODs see: http://www.digilentinc.com/pmods

FPGA

Pin # I/O Signal

Connector

Pin #

Connector

Pin # I/O Signal

FPGA

pin #

H12 FPGA_PMOD2_P1 1 7 FPGA_PMOD2_P7 K12

G13 FPGA_PMOD2_P2 2 8 FPGA_PMOD2_P8 K13

E16 FPGA_PMOD2_P3 3 9 FPGA_PMOD2_P9 F17

E18 FPGA_PMOD2_P4 4 10 FPGA_PMOD2_P10 F18

GND

5 11

GND

+3.3V_LS1

6 12

+3.3V_LS1

Table 9 – Peripheral Module Connections – J4

FPGA

Pin # I/O Signal

Connector

Pin #

Connector

Pin # I/O Signal

FPGA

pin #

F15 FPGA_PMOD1_P1 1 7 FPGA_PMOD1_P7 F14

F16 FPGA_PMOD1_P2 2 8 FPGA_PMOD1_P8 G14

C17 FPGA_PMOD1_P3 3 9 FPGA_PMOD1_P9 D17

C18 FPGA_PMOD1_P4 4 10 FPGA_PMOD1_P10 D18

GND

5 11

GND

+3.3V_LS1

6 12

+3.3V_LS1

Table 10 – Peripheral Module Connections – J5

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Figure 8 – PMOD Connector Pinout

2.6 User Interfaces

2.6.1 User LEDs

Four discrete “high-brightness, low Vf” LEDs are installed on the board and can be used to display the status of the internal

logic. These LEDs are attached as shown below and are lit by forcing the associated FPGA I/O pin to a logic ‘1’ and are off

when the pin is either low (0) or not driven.

Net Name Reference FPGA Pin#

FPGA_GPIO_LED1 D2 P4

FPGA_GPIO_LED2 D3 L6

FPGA_GPIO_LED3 D9 F5

FPGA_GPIO_LED4 D10 C2

Table 11 – LED Pin Assignments

2.6.2 Four configurable FPGA user DIP switches (Tyco 1571983-4)

FPGA

DIP switch

FPGA Pin#

FPGA_DIP1 B3

FPGA_DIP2 A3

FPGA_DIP3 B4

FPGA_DIP4 A4

Table 12 – FPGA DIP Switches

Please note that internal pulldowns are required for these pins.

2.6.3 One configurable FPGA user push-button (Tyco 8-1437565-0)

FPGA Push

button

FPG

A Pin#

USER_RESET V4

Table 13 – FPGA Push-Button

Please note that an internal pulldown is required for this pin.

2.7 Power

The Texas Instruments TPS65708 provides two high-efficiency switching converters, two LDOs, and an LED driver. The output

voltages are tuned internally on the device. The default values are 3.3 V and 1.8 V for the switchers and 2.8 V and 1.2 V for the

LDOs. In this implementation, the 2.8 V LDO output is not utilized.

1 2 3 4 5 6

7 8 9

10 11 12

1 2 3

4 5 6

7 8 9

10 11 12

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The Spartan-6 FPGA core voltage requires 1.2 V. Estimated max current is 160 mA. This is supplied by LDO2 on the TPS65708.

The input voltage is the 1.8 V generated by DCDC2.

The DCDC2 regulator generates 1.8 V. This voltage powers the Mobile DDR, FPGA Vcco, and the sources LDO2. Estimated max

current is 210 mA, plus the 160 mA that the 1.2 V LDO needs.

The DCDC1 regulator generates 3.3 V. This voltage powers the Flash, Ethernet, PMODs, Vcco_0, Vcco_1, and Vcco_2. Estimated

max current for the board circuits is 370 mA, which includes 50 mA for each PMOD.

The TPS65708 has built-in sequencing, resulting in a power-up sequence of 3.3 V  1.8 V  2.8 V  1.2 V.

Figure 9 – TPS65708 Connections

2.7.1 Power Good LED

A Green status LED is used to indicate when power is good on the board. This is tied to the ISINK of the TPS65708, while the

PWM input to the LED driver is connected to the 1.2 V supply. This ensures that the Power Good LED reflects the true

sequencing status of all supplies.

2.7.2 FPGA Decoupling

The decoupling requirements for the Spartan-6 device are specified in Xilinx UG393 Spartan-6 FPGA PCB Design Guide.

The S6LX9 MicroBoard follows the intent of these guidelines with a few variations:

• A 0.22 uF, 6.3 V, 0201 package capacitor is used for the smallest capacitor bin rather than 0.47 uF. The S6LX9

MicroBoard layout was constrained to using the 0201 package, and 0.22 uF was the largest available capacitance rated at

least 6.3 V. To compensate, twice the UG393-suggested number of caps are used.

• A 4.7 uF, 6.3 V, 0402 package capacitor is used for the medium capacitor bin rather than the 0805 package. As stated in

UG393, a smaller package is acceptable, and in fact provides better characteristics than the 0805 package.

• 100 uF, 6.3 V, 1206 package capacitor is used for the bulk capacitor bin. Again, a smaller package is used.

Please note that extensive testing during development has shown that 2.2 uF 0402 caps can be utilized instead of 4.7 uF 0402

caps in this application. To save on board space and costs this was extrapolated to a reduction in the number of 4.7 uF 0402

caps required for proper operation in this configuration.

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Value Body

Size Type ESL

Max ESR

Min ESR

Max Voltage

Rating Part Number

100 uF 1206 2-Terminal

Ceramic X5R 5 nH

6.3 V Murata GRM31CR60J107ME39L

4.7 uF 0402 2-Terminal

Ceramic X5R 2 nH

6.3 V Panasonic ECJ-0EB0J475M

0.22 uF 0201 2-Terminal

Ceramic X5R

1.5 nH

mΩ

6.3 V Panasonic ECJ-ZEB0J224M

Table 14 – Spartan-6 FPGA LX9 MicroBoard Capacitors for XC6SLX9-CSG324

Vccint Vccaux

Vcc

Bank 0

Vcc

Bank 1

Vcc

Bank 2

Vcc

Bank 3

100 uF 1 1 1 1 1 1

4.7 uF 2 1 2 2 2 2

0.22 uF 4 6 4 4 4 4

Table 15 – Spartan-6 FPGA LX9 Board Capacitor Quantities for XC6SLX9-CSG324

2.7.3 Power Results

The power circuitry was tested during the prototyping phase to verify compliance with the Xilinx Spartan-6, Micron LPDDR,

and Texas Instruments TPS65708 power requirements, such as:

• Power rail assignment

o Spartan-6 Vccint  1.2 V

o Spartan-6 Vccaux  3.3 V

o Spartan-6 Vcco_0,_1,_2  3.3 V

o Spartan-6 Vcco_3  1.8 V

o LPDDR V

, V

DDQ

 1.8 V

o TPS65708 V

, V

IN1

, V

IN2

 5 V

• Tolerance

o 1.2 V 1.14 to 1.26 V

o 1.8 V 1.71 to 1.89 V

o 3.3 V  3.15 to 3.45 V

o 5 V  3.6 to 6.0 V

• Ramp time

o 0.20 to 85 ms

o In-rush current does not overload the power circuitry at start-up

• Monotonicity

o No negative dips in 1.2 V, 1.8 V, or 3.3 V

• Sequencing

o Sequencing responds as expected based on design

2.8 Configuration

The Spartan-6 FPGA LX9 MicroBoard supports three methods of configuring the FPGA. The possible configuration sources

include Boundary-scan (On-board circuitry through P1), Boundary-scan (JTAG cable through J6), or Serial Peripheral Interface

(SPI Flash in x1, x2, or x4 modes).

The blue LED on the board illuminates to indicate when the FPGA has been successfully configured.

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2.8.1 Configuration Modes

The S6LX9 MicroBoard is hardwired with a 4.87 K pullup resistor on HSWAPEN, M0 tied directly to 3.3 V and M1 tied directly

to GND. This puts the MicroBoard in Master Serial / SPI mode, always.

Spartan-6 devices have a dedicated four-wire JTAG port that is always available to the FPGA regardless of the mode pin

settings. The default configuration mode is “Master Serial / SPI” mode, which allows the FPGA to configure from the multi-I/O

SPI Flash device. The Flash is programmed at the factory with basic test application code to test the on-board peripherals.

The push button (SW4) is connected to the FPGA PROG pin and pulled up. Pushing the button connects PROG to ground.

Upon releasing the button, a re-configuration is initiated. This line can also be pulled low by the AT90USB162 /

ATMEGA162U2. In this case it holds off the FPGA configuration indefinitely, while programming flash memory.

After successful configuration, blue LED D1 lights when the FPGA DONE is asserted. Go to the Avnet DRC for the complete

Spartan-6LX9 MicroBoard Configuration User Guide.

2.8.2 Digilent On-board JTAG Boundary Scan Configuration

The Spartan-6 FPGA LX9 MicroBoard can be configured directly via full speed USB on-board circuitry featuring the Digilent

iMPACT plug-in. This method utilizes an AT90USB162 / ATMEGA162U2 as a USB / JTAG bridge to do a JTAG boundary

scan utilizing the Digilent Plug-in and the USB-A connection. Note that the AT90USB162 is now replaced with the fully

compatible ATMEGA162U2.

2.8.3 Multi-I/O SPI Flash Configuration

All three possible I/O modes for the SPI Flash – Quad, Double, and Single – are supported on the S6LX9 board through

iMPACT. Currently, the Digilent direct write SPI Flash programmer only works in Single mode.

2.8.4 JTAG Chain

The Spartan-6 FPGA LX9 MicroBoard has one device in the JTAG chain, the Spartan-6 FPGA LX9 FPGA.

Configuring the Spartan-6 FPGA on the S6LX9 MicroBoard can be performed via Boundary Scan with a JTAG download

cable. The cable is attached to the 14-pin, 2 mm spaced keyed header J4 (Figure ) with a ribbon cable.

Figure 10 – Xilinx Ribbon Cable JTAG Connector

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3.0 Test Design

The S6LX9 MicroBoard factory test is programmed into the Micron SPI Flash as part of the functional test when

the boards are built. The results of this test are described in the Xilinx® Spartan®-6 LX9 MicroBoard Getting

Started Guide, the full version of which is available on the DRC. Access to the factory test source archive,

including a document describing the factory test procedure, may be achieved by contacting your local

Avnet/Silica FAE or Avnet Centralized Technical Support.

4.0 Acknowledgements

Avnet would like to acknowledge the following key partners for their key contributions to this project.

Atmel

• USB 2.0 Full Speed USB-to- JTAG bridge via Atmel ATMEGA162U2

Micron

• Multi-I/O SPI Flash

• LPDDR Memory

National Semiconductor

• 10/100 Ethernet PHY

TE Connectivity

• RJ45 connector with Integrated Magnetics

• USB-A connector

• Micro-B USB connector

• DIP switch

• Push buttons

• USB Protection for electro-static discharge and over-voltage

Texas Instruments (www.ti.com/xilinxfpga)

• Clock PLL

• Power Management Unit for voltage regulation

Xilinx

• Spartan-6 FPGA

o www.xilinx.com/spartan6

• Xilinx ISE® Design Suite (IDS) DVD WebPACK edition

• ChipScope™ Pro and SDK license voucher (device-locked to XC6SLX9)

5.0 Getting Help and Support

The Spartan-6 FPGA LX9 MicroBoard home page with Documentation and Reference Designs is located at:

• www.em.avnet.com/s6microboard

Avnet Spartan-6 FPGA LX9 MicroBoard forum:

• http://community.em.avnet.com/t5/Spartan-6-LX9-MicroBoard/bd-p/Spartan-6LX9MicroBoard

For Xilinx technical support, you may contact Xilinx Online Technical Support at www.support.xilinx.com. On this site you will also find

the following resources for assistance:

Avnet Electronics Marketing 19 of 19 Rev C 11/08/2011

• Software, IP, and Documentation Updates

• Access to Technical Support Web Tools

• Searchable Answer Database with Over 4,000 Solutions

• User Forums

• Training - Select instructor-led classes and recorded e-learning options

Contact Avnet Support for any questions regarding the Spartan-6 FPGA LX9 MicroBoard reference designs or kit hardware

• http://www.em.avnet.com/techsupport

You can also contact your local Avnet/Silica FAE.

6.0 Document Revision Table

Revision Date Change

A 2/28/2011 Initial Release

B 7/27/2011

Modified Tables 9 and 10 to reflect PMOD pin order; Changed

USER_RESET_N to USER_RESET to reflect actual polarity; Updated

page 10 TBD references. Changed reference to Factory Test availability

on DRC to Avnet/Silica FAE or Avnet Centralized Technical Support;

Removed version reference for DVD WebPACK.

C 11/6/2011

Added this revision table; Added PMOD pinout figure 8; Added Atmel

and National as board sponsors; Changed Atmel

AT90USB162references to Atmel AT90USB162 / ATMEGA162U2;

Moved LED’s to Bank 3 in Figure 4.

Xlx_s9_lx9_fpga_microboard Ug110311x Xilinx Spartan 6 LX9 Micro Board Rev B2 Hardware User Guide

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