Use the data path to trace the execution path of the following MIPS instructions

Question

Use the data path

to trace the execution path of the following MIPS instructions (one instruction per diagram):

and $t0, $t1, $t2

sw $t0, 1024( $t1 )

beq $t0, $t1, L1 # address of L1 is 0xA100

On each diagram, indicate the values of all bit segments ( ex. [31-26] ) and the values for all control signals.

0 Add Add ALU Addresult Shift left 2 RegDst Branch MemRead Instruction [31-26] emtoReg Control ALUO emWrite ALUSrc RegWrite Instruction [25-21 Read Read Paddress register 1 Read Instruction [20-16] Read data 1 register 2 Write Read Zero ALU ALU result Instruction 31-0) e data 2 Read Address data Instruction memor)y | |Instruction [15-11] registe Write data Registers Write Data data memor Instruction [15-0] 16 Sign- 32 ALU control extend Instruction [5-0]

Explanation / Answer

truction: r3 = r1 + r2 R 0 rs=r1 rt=r2 rd=r3 shft=X funct=32 1. instruction fetch move instruction address from PC to memory address bus assert memory read move data from memory data bus into IR configure ALU to add 1 to PC configure PC to store new value from ALUout 2. instruction decode op-code bits of IR are input to control FSM rest of IR bits encode the operand addresses (rs and rt) – these go to register file 3. instruction execute set up ALU inputs configure ALU to perform ADD operation configure register file to store ALU result (rd)

Related Questions

Navigate

• Browse (All)
• Browse U
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.