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Microcoded Implementation of a CPU Archtecture

Microcoded Implementation of a CPU Archtecture. Summary from Matlo Handout. What Identifies CPU Architecture. Instruction set Addressing mode Direct e.g. ac := ac + m[x] Indirect e.g. m[ac] := m[sp]; sp:=sp+1 local e.g. ac := ac + m[sp+x] Register sets 16 registers, 16-bit wide.

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Microcoded Implementation of a CPU Archtecture

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  1. Microcoded Implementation of a CPU Archtecture Summary from Matlo Handout

  2. What Identifies CPU Architecture • Instruction set • Addressing mode • Direct e.g. ac := ac + m[x] • Indirect e.g. m[ac] := m[sp]; sp:=sp+1 • local e.g. ac := ac + m[sp+x] • Register sets • 16 registers, 16-bit wide

  3. Microcoded Approach • Control store simulates architecture • Microinstructions and instructions share the resources • .def: Machine definition • .mal: Microprogram • .asm: Test program

  4. c dcd Register File b dcd a dcd b a c 4 3 2 1 latch latch mar mmux mpc increment mbr amux Control Store ALU amux cond alu mar b a addr sh mbr rd enc wr c n,z shifter

  5. Assignment 1 • Modify such that • It does not use a shifter. • It implements the new instruction: multiply from memory MULD (ac := ac * m[x]) Rewrite the code for the MAC-1 program fact.asm (contained in the micmac distribution) so that it uses MULD. • Then modify one.mal so that it only contains instructions necessary to run fact.asm.

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