Question

2. Provide the type and assembly language instruction for the following binary value: 0000 0001 0100 1000 1010 1000 0010 0000 (binary)

Answer 1

0000 0001 0100 1000 1010 1000 0010 0000

Given Binary Format Change it to MIPS R-Type Instruction format as first 6 digits are 0's.

MIPS machine code format

32 bits total

opcode:6 bits

registers 1-3: 5 bits

r1=source,r2=source2,r3=destination

shift amount (SHAMT): 5 bits

function code: 6 bits

000000	10000	10000	10000	00000	100000
OPCODE(6 bits)	RS(5 bits)	RT(5 bits)	RD(5 bits)	SHAMT(5 bits)	FUNCTION(6 bits)

It is an R- Type as first 6 digits are 000000

RD: Register Destination

RS: 1st Source Register

RT: 2nd Source Register

Function:Which type of arithmetic

As we have 100000 in Function register we it indicates ADD Instruction

Typical ADD instruction in MIPS R-Type instruction looks like this

ADD $T1,$T2,$T3

Contents of $T2 and $T3 are added and stored in destination register $T1

As we have same register for source1, source2 and destination register we denote it by $T0

So instruction for the above binary code look somewhat like this

ADD $T0,$T0,$T0