Add Izero 4-> (O MOX- (0 ALU Add, 1 result Shift RegDst Branch left 2 MemRead Instruction [31-26] MemtoReg Control ALUOP MemWrite ALUSrc PCSrce RegWrite Instruction [25-21] Read PC Read address register 1 Read Instruction [20-16] data 1 Read Zero Instruction [31-0] register 2 M Write Read data 2 ALU ALU Read Ο Instruction Instruction [15-11] register memory Write data Registers OMIX) Address result data M Write Data data memory Instruction [15-0] 16 32 Sign- extend ALU control Instruction [5-0]
Don't use
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li $t2, 2 |
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L1: |
add $t1, $t1, $t2 |
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sub $t1, $t1, $t3 |
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bne $t1, $t4, L1 |
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sub $t4, $s0, $t3 |
Given the modified single-cycle processor shown below, what are the values (in binary) of instruction[31-26], instruction[25-21], instruction[20-16], instruction[15-11], instruction[5-0], Read data 1, Read data 2, ALU zero, PCSrc, and all the main control decoded output signals when the time is at 1950 ns. The below single-cycle processor diagram can be used for your reference.
Note: A new decoded signal output “Tzero” is added for executing “bne” instruction. The signal definition is described below:
|
Instruction |
Opcode |
New Main Control Output Signal |
|
beq |
00100b (4d) |
Tzero = 0 |
|
bne |
00101b (5d) |
Tzero = 1 |
At the moment of 1950 ns, the below values (0, 1 or X) are:
instruction[31-26] =
instruction[25-21] =
instruction[20-16] =
instruction[15-0] =
Read data 1 output =
Read data 2 output =
RegDst =
ALUSrc =
MemtoReg =
RegWrite =
MemRead =
MemWrite =
Branch =
ALUop[1:0] =
ALU zero =
PCSrc =
![Add
Izero
4->
(O MOX-
(0
ALU
Add,
1
result
Shift
RegDst
Branch
left 2
MemRead
Instruction [31-26]
MemtoReg
Control
ALUOP
MemWrite
ALUSrc
PCSrce
RegWrite
Instruction [25-21]
Read
PC
Read
address
register 1 Read
Instruction [20-16]
data 1
Read
Zero
Instruction
[31-0]
register 2
M
Write
Read
data 2
ALU ALU
Read
Ο
Instruction
Instruction [15-11]
register
memory
Write
data Registers
OMIX)
Address
result
data
M
Write
Data
data memory
Instruction [15-0]
16
32
Sign-
extend
ALU
control
Instruction [5-0]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fabc7153f-9b3e-43e2-8cc1-f1a38693c826%2F2a441f4f-7a2b-4108-b685-d39f90d66811%2Fwkjd6f6_processed.jpeg&w=3840&q=75)
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