What is Microprogram? Write microprogram for following operations.

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What is Microprogram? Write microprogram for following operations.

written 5.7 years ago by

teamques10 ★ 69k

• modified 3.1 years ago

i) ADD R1, M, Register R1 and Memory location M are added and result store at Register R1.
ii) MUL R1, R2 Register R1 and Register R2 are multiplied and result store at Register R1.

computer organization and architecture

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written 3.1 years ago by

teamques10 ★ 69k

Microprogram

Microprogramming is the process of writing microcode for a microprocessor.
Microcode is low-level code that defines how a microprocessor should function when it executes machine-language instructions.
Typically, one machine language instruction translates into several microcode instructions, on some computers, the microcode is stored in ROM and cannot be modified.

Micro Program to add R1, M.

T-state	Operation	Micro Instructions
T 1	PC → MAR	PCout, Marin, Read, Clear y, set Cin, Add, Zinn
T 2	M → MBR PC <-- PC + 1	Zout, PCin, Wait for memory fetch cycle
T 3	MBR → IR	MBRout, IRin
T 4	R1 → x	R1out, Xin, CLRC
T 5	M → ALU	Mout, ADD, Zin
T 6	Z → R1	Zout, R1in
T 7	Check for intr	Assumption enabled intr pending, CLRX, SETC, Spout, SUB, Zin
T 8	SP <-- SP – 1	Zout, Spin, MARin
T 9	PC → MDR	PCout, MDRin, WRITE
T 10	MDR → [SP]	Wait for Mem access
T 11	PC <--IS Raddr	PCin IS Raddr out

Micro Program to MUL R1, R2

T- state	Operation	Micro Instructions
T 1	PC → MAR	PCout, Marin, Read, Clear y, set Cin, Add, Zinn
T 2	M → MBR PC<--PC + 1	Zout, PCin, Wait for memory fetch cycle
T 3	MBR → IR	MBRout, IRin
T 4	R1 → x	R1out, Xin, CLRC
T 5	R2 → ALU	R2out, MUL, Zin
T 6	Z → R1	Zout, R1in
T 7	Check for intr	Assumption enabled intr pending, CLRX, SETC, Spout, SUB, Zin
T 8	SP <-- SP – 1	Zout, Spin, MARin
T 9	PC → MDR	PCout, MDRin, WRITE
T 10	MDR → [SP]	Wait for Mem access
T 11	PC <-- IS Raddr	PCin IS Raddr out.

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