ALU Shift left 2 instruction B126 Instruction 125211 Read ad

ALU Shift left 2 instruction B1-26] Instruction 125-211 Read address register 1 Read truction 120-161 Read data 1 PC (6) register 2 131-01 ALU ALU Read Write nstruction Instruction 15-11 register result Address Read data 2 data Registers Write Data data memory Instruction [15-01 extend control Instruction 15.01 Figure 1 The simple datapath with the control unit The explanation of the control signals is as follows:

Solution

Instr 1 : Addiu $t0 ,10
The above instruction loads the result 10 into the register t0
t0 is loaded with 10
Instr 2 : lb $st1,32($t0)
The above instruction loads the value at location t0 +32 into t1 register
The value at location ( 10+32 ) will be loaded into register t1
Instr 3 : or $t2,$t0,$t1
The above instruction bitwise or’s the values in the registers t0,t1 and loads the result of the or operation into register t2
Instr 4 : bne $t2,$t0,QUIT
The above instruction checks whether the values in the registers t2,t0 are equal or not and if they are equal then the program counter loads the next instruction and if they are not equal then the program counter loads the address of the label QUIT
That is branch if not equal to QUIT
Instr 4 : j 2500
The above instruction will load the program counter with 2500 that is the next instruction to be executed is at the address 2500 . so jump to 2500 is used

Instr 1 : Addiu $t0 ,10

The above instruction loads the result 10 into the register t0

t0 is loaded with 10

Instr 2 : lb $st1,32($t0)

The above instruction loads the value at location t0 +32 into t1 register

The value at location ( 10+32 ) will be loaded into register t1

Instr 3 : or $t2,$t0,$t1

The above instruction bitwise or’s the values in the registers t0,t1 and loads the result of the or operation into register t2

Instr 4 : bne $t2,$t0,QUIT

The above instruction checks whether the values in the registers t2,t0 are equal or not and if they are equal then the program counter loads the next instruction and if they are not equal then the program counter loads the address of the label QUIT

That is branch if not equal to QUIT

Instr 4 : j 2500

The above instruction will load the program counter with 2500 that is the next instruction to be executed is at the address 2500 . so jump to 2500 is used