CS 61C discussion 11 (1) Jaein Jeong 2002 Draw the data path: ADD or SUB Clk 555 RwRaRb 32 32-bit Registers Extender Clk WrEn Adr Data Memory ALU Instruction.

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Presentation transcript:

CS 61C discussion 11 (1) Jaein Jeong 2002 Draw the data path: ADD or SUB Clk 555 RwRaRb bit Registers Extender Clk WrEn Adr Data Memory ALU Instruction Imm16RdRtRs = Adder PC Clk 00 4 PC Ext Adr Inst Memory

CS 61C discussion 11 (2) Jaein Jeong 2002 Draw the data path: ORI Clk 555 RwRaRb bit Registers Extender Clk WrEn Adr Data Memory ALU Instruction Imm16RdRtRs = Adder PC Clk 00 4 PC Ext Adr Inst Memory

CS 61C discussion 11 (3) Jaein Jeong 2002 Draw the data path: Load word Clk 555 RwRaRb bit Registers Extender Clk WrEn Adr Data Memory ALU Instruction Imm16RdRtRs = Adder PC Clk 00 4 PC Ext Adr Inst Memory

CS 61C discussion 11 (4) Jaein Jeong 2002 Draw the data path: Store word Clk 555 RwRaRb bit Registers Extender Clk WrEn Adr Data Memory ALU Instruction Imm16RdRtRs = Adder PC Clk 00 4 PC Ext Adr Inst Memory

CS 61C discussion 11 (5) Jaein Jeong 2002 Draw the data path: Branch equal Clk 555 RwRaRb bit Registers Extender Clk WrEn Adr Data Memory ALU Instruction Imm16RdRtRs = Adder PC Clk 00 4 PC Ext Adr Inst Memory Mux

CS 61C discussion 11 (6) Jaein Jeong 2002 A Summary of the Control Signals oprsrtrdshamtfunct oprsrt immediate R-type I-type add, sub ori, lw, sw, beq addsuborilwswbeq RegDst ALUSrc MemtoReg RegWrite MemWrite nPCsel ALUctr x x func op Appendix A See We Don’t Care :-) ExtOpxx011x ALUctr AddSubtractOrAdd Subtract ALUctr OR: 001 ADD: 010 SUB: xx

CS 61C discussion 11 (7) Jaein Jeong 2002 Writing controls in Boolean formula °Express following variables in Boolean formula of OPCode and Func Add = OP[5]’*OP[4]’*OP[3]’*OP[2]’*OP[1]’*OP[0]’ *F[5] *F[4]’ *F[3]’ *F[2]’ *F[1]’ *F[0]’ Sub = OP[5]’*OP[4]’*OP[3]’*OP[2]’*OP[1]’*OP[0]’ *F[5] *F[4]’ *F[3]’ *F[2]’ *F[1] *F[0]’ Ori = OP[5]’*OP[4]’*OP[3]*OP[2]*OP[1]’*OP[0]’ Lw = OP[5]*OP[4]’*OP[3]’*OP[2]’*OP[1]*OP[0] Sw = OP[5]*OP[4]’*OP[3]*OP[2]’*OP[1]*OP[0] Beq = OP[5]’*OP[4]’*OP[3]’*OP[2]*OP[1]’*OP[0]’

CS 61C discussion 11 (8) Jaein Jeong 2002 Writing controls in Boolean formula °Express following variables in Boolean formula of Add, Sub, Ori, Lw, Sw, Beq, OPCode, or Func RegDst = Add + Sub ALUSrc = Ori + Lw + Sw MemtoReg = Lw RegWrite = Add + Sub + Ori + Lw MemWrite = Sw nPCsel = Beq ExtOp = Lw + Sw ALUctr = Sub + Beq ALUctr = Add + Sub + Lw + Sw + Beq ALUctr = Ori