FOR MIPS architecture QUESTION 2 Part a) Write the three microinstructions of th

ID: 3739326 • Letter: F

Question

FOR MIPS architecture

QUESTION 2 Part a) Write the three microinstructions of the "branch-on-equal' (beq) instruction. (20 points) PCWriteSequencing ALU Control Register Memory Control Control Label SRC1 SRC2 Fetch Branchl Field Possible Value This is the label of the microinstruction. It can be any word. The first Label ALU Control SRC 1 SRC 2 microinstruction has the label 'Fetch Add, Subt, Func Code PC, A B, 4, Extend, Extshft (16-bit sign extended and shifted) Read, Write ALU, Write MDR (memory data register) Read PC, Read ALU, Write ALU ALU, ALUOut Cond (conditional), Jump address Seq, Fetch, Dispatch i (i is the current state) Memory PC Write Control Sequencing

Explanation / Answer

Label

ALU Control

SRC1

SRC2

Register Control

Memory

PCWrite Control

Sequencing

Fetch

ADD

Read PC

ALU

Seq

Beq1

Subt

ALUOUT[a1] -cont

Fetch[a2]

Branch1

Branch address

Fetch[a3]

[a1]If the values are equal ALU contents will be written to PC

[a2]Go to microinstruction fetch

[a3]Go to microinstruction fetch

These are the sequence of instructions to be performed for 'beq' instruction