In this assignment you will design a small version of MIPS processor. Its name is MiniMIPS. In MiniMIPS, there are 8 registers each holding 32 bit numbers. The instruction width is 16 bits instead of 32 bits in MIPS. There are two types of instructions in MiniMIPS.
R’-type:
Op (4bits)
Rs (3bits)
Rt (3bits)
Rd(3bits)
Func(3bits)
I’-type:
Op (4bits)
Rs (3bits)
Rt (3bits)
Imm (10bits)
The instructions of MiniMIPS are given in below table:
Instr
Opcode
Func
AND
0000
000
ADD
0000
001
SUB
0000
010
XOR
0000
011
NOR
0000
100
OR
0000
101
ADDI
0001
XXX
ANDI
0010
XXX
ORI
0011
XXX
NORI
0100
XXX
BEQ
0101
XXX
BNE
0110
XXX
SLTI
0111
XXX
LW
1000
XXX
SW
1001
XXX
They all work similar to the actual MIPS Green Sheet. As immediate field is 10 bits you should extend it to 32 bits. Do not forget, only the instruction width and number of registers are different remaining part is same as MIPS. The register contents are 32 bits. Zero register is always 0. All other rules in MIPS are also rules of MiniMIPS.
