I want to learn basic Idea that how dose Instruction set Implement
look at following handy example
8 bit Instruction set
first 4 bit for Alu function
last 4 bit for register
A=address register 4bit
I=instruction register 4bit
R1= register 4 bit
R2= register 4 bit
and If ALU_OR 4'b1001
If ALU_AND 4'b0111
I made above example just for learning
look at following handy example
8 bit Instruction set
first 4 bit for Alu function
last 4 bit for register
A=address register 4bit
I=instruction register 4bit
R1= register 4 bit
R2= register 4 bit
Code:
alu function AIR1R2
ALU_NOP 4'b0000 XXXX
ALU_ADD 4'b0001 XXXX
ALU_SUB 4'b0010 XXXX
ALU_MUL 4'b0011 XXXX
ALU_DIV 4'b0100 XXXX
ALU_DA 4'b0101 XXXX
ALU_NOT 4'b0110 XXXX
ALU_AND 4'b0111 XXXX
ALU_XOR 4'b1000 XXXX
ALU_OR 4'b1001 XXXX
ALU_RL 4'b1010 XXXX
ALU_RLC 4'b1011 XXXX
ALU_RR 4'b1100 XXXX
ALU_RRC 4'b1101 XXXX
ALU_INC 4'b1110 XXXX
ALU_XCH 4'b111 XXXXand If ALU_OR 4'b1001
Code:
AIR1R2 alu out
0000 0
0001 1
0010 1
0011 1
0000 0
0001 1
0010 1
0011 1
0000 0
0001 1
0010 1
0011 1
0000 0
0001 1
0010 1
0011 1
Code:
AIR1R2 alu out
0000 0
0001 0
0010 0
0011 1
0000 0
0001 0
0010 0
0011 1
0000 0
0001 0
0010 0
0011 1
0000 0
0001 0
0010 0
0011 1
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