Simple Instructions Exemple
Simple_Instructions_Exemple
Simple_Instructions_Exemple
Simple_Instructions_Exemple
User Manual: Pdf
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EXAMPLE 1
Instruction Memory’s file: 5th_fig421_MemEx1/inst.rom
The user should set initial register values (linear). No data values are required.
Description: A simple sequence of five “add” instructions with no hazards.
ADD r1,r1,r2
ADD r3,r0,r2
ADD r4,r0,r2
ADD r5,r0,r2
ADD r6,r0,r2
ADD r1,r1,r2 – type R instruction
opcode = 0 rs = 1 rt = 2 rd = 1 sh = 0 func = 32
000000 00001 00010 00001 00000 100000
0x00220820
ADD r3,r0,r2 – type R instruction
opcode = 0 rs = 0 rt = 2 rd = 3 sh = 0 func = 32
000000 00000 00010 00011 00000 100000
0x00021820
ADD r4,r0,r2 – type R instruction
opcode = 0 rs = 0 rt = 2 rd = 4 sh = 0 func = 32
000000 00000 00010 00100 00000 100000
0x00022020
ADD r5,r0,r2 – type R instruction
opcode = 0 rs = 0 rt = 2 rd = 5 sh = 0 func = 32
000000 00000 00010 00101 00000 100000
0x00022820
ADD r6,r0,r2 – type R instruction
opcode = 0 rs = 0 rt = 2 rd = 6 sh = 0 func = 32
000000 00000 00010 00110 00000 100000
0x00023020
The hexadecimal code example is:
ADD r1,r1,r2 – 0x00220820
ADD r3,r0,r2 – 0x00021820
ADD r4,r0,r2 – 0x00022020
ADD r5,r0,r2 – 0x00022820
ADD r6,r0,r2 – 0x00023020
Calculations check (with linear initial register values):
ADD r1,r1,r2 – r1 = 3
ADD r3,r0,r2 – r3 = 2
ADD r4,r0,r2 – r4 = 2
ADD r5,r0,r2 – r5 = 2
ADD r6,r0,r2 – r6 = 2
