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cslotterback committed Jul 22, 2013
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module MIPS_CONTROL
(
op_in,
func_in,

branch_out,
regWrite_out,
regDst_out,
extCntrl_out,
ALUSrc_out,
ALUCntrl_out,
memWrite_out,
memRead_out,
memToReg_out,
jump_out,

);

parameter control_delay = 6;

input [5:0] op_in, func_in;

output [3:0] ALUCntrl_out;
reg [3:0] ALUCntrl_out;

output branch_out, jump_out;
reg branch_out, jump_out;

output regWrite_out, regDst_out;
reg regWrite_out, regDst_out;

output extCntrl_out, ALUSrc_out;
reg extCntrl_out, ALUSrc_out;

output memWrite_out, memRead_out, memToReg_out;
reg memWrite_out, memRead_out, memToReg_out;


always@*
begin
#control_delay;

casex({op_in, func_in})

// nop
{6'h0, 6'h0}:
begin
regDst_out = 1'b0; //0 means RT and 1 means RD
ALUSrc_out = 1'b0; //0 means REG and 1 means IMM
memToReg_out = 1'b0; //0 means NO and 1 means YES
regWrite_out = 1'b0; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'b0; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'b0; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0010; //pg316*

end // case: {6'h0, 6'h0}

// addi
{6'h8, 6'hx}: // addi
begin
regDst_out = 1'b0;
ALUSrc_out = 1'b1;
memToReg_out = 1'b0;
regWrite_out = 1'b1;
memWrite_out = 1'b0;
memRead_out = 1'b0;
branch_out = 1'b0;
jump_out = 1'b0;
extCntrl_out = 1'b1;
ALUCntrl_out = 4'b0010;

end // case: {6'h8, 6'hx}

{6'hf, 6'hx}: // lui
begin
regDst_out = 1'b0;
ALUSrc_out = 1'b1;
memToReg_out = 1'b0;
regWrite_out = 1'b1;
memWrite_out = 1'b0;
memRead_out = 1'b0;
branch_out = 1'b0;
jump_out = 1'b0;
extCntrl_out = 1'bx;
ALUCntrl_out = 4'b1111;

end // case: 6'hf

{6'h0, 6'h20}: // add
begin
regDst_out = 1'b1;
ALUSrc_out = 1'b0;
memToReg_out = 1'b0;
regWrite_out = 1'b1;
memWrite_out = 1'b0;
memRead_out = 1'b0;
branch_out = 1'b0;
jump_out = 1'b0;
extCntrl_out = 1'bx;
ALUCntrl_out = 4'b0010;

end // case: {6'h0, 6'h20}



{6'h0, 6'h22}: //sub
begin
regDst_out = 1'b1; //0 means RT and 1 means RD
ALUSrc_out = 1'b0; //0 means REG and 1 means IMM
memToReg_out = 1'b0; //0 means NO and 1 means YES
regWrite_out = 1'b1; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'b0; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'bx; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0110; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}



{6'h0, 6'h2a}: //slt
begin
regDst_out = 1'b1; //0 means RT and 1 means RD
ALUSrc_out = 1'b0; //0 means REG and 1 means IMM
memToReg_out = 1'b0; //0 means NO and 1 means YES
regWrite_out = 1'b1; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'b0; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'bx; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0111; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}


{6'hd, 6'hx}: //ori
begin
regDst_out = 1'b0; //0 means RT and 1 means RD
ALUSrc_out = 1'b1; //0 means REG and 1 means IMM
memToReg_out = 1'b0; //0 means NO and 1 means YES
regWrite_out = 1'b1; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'b0; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'b1; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0001; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}

{6'ha, 6'hx}: //slti
begin
regDst_out = 1'b0; //0 means RT and 1 means RD
ALUSrc_out = 1'b1; //0 means REG and 1 means IMM
memToReg_out = 1'b0; //0 means NO and 1 means YES
regWrite_out = 1'b1; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'b0; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'b1; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0111; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}

{6'h23, 6'hx}: //lw
begin
regDst_out = 1'b0; //0 means RT and 1 means RD
ALUSrc_out = 1'b1; //0 means REG and 1 means IMM
memToReg_out = 1'b1; //0 means NO and 1 means YES
regWrite_out = 1'b1; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'b1; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'b1; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0010; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}

{6'h2b, 6'hx}: //sw
begin
regDst_out = 1'b0; //0 means RT and 1 means RD
ALUSrc_out = 1'b1; //0 means REG and 1 means IMM
memToReg_out = 1'bx; //0 means NO and 1 means YES
regWrite_out = 1'b0; //0 means NO and 1 means YES
memWrite_out = 1'b1; //0 means NO and 1 means YES
memRead_out = 1'b0; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'b1; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0010; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}

{6'h4, 6'hx}: //beq
begin
regDst_out = 1'b0; //0 means RT and 1 means RD
ALUSrc_out = 1'b0; //0 means REG and 1 means IMM
memToReg_out = 1'bx; //0 means NO and 1 means YES
regWrite_out = 1'b0; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'b0; //0 means NO and 1 means YES
branch_out = 1'b1; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'b1; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0110; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}

{6'h5, 6'hx}: //bne
begin
regDst_out = 1'b1; //0 means RT and 1 means RD
ALUSrc_out = 1'b0; //0 means REG and 1 means IMM
memToReg_out = 1'bx; //0 means NO and 1 means YES
regWrite_out = 1'b0; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'b0; //0 means NO and 1 means YES
branch_out = 1'b1; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'b1; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0110; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}

{6'h2, 6'hx}: //j
begin
regDst_out = 1'b0; //0 means RT and 1 means RD
ALUSrc_out = 1'bx; //0 means REG and 1 means IMM
memToReg_out = 1'bx; //0 means NO and 1 means YES
regWrite_out = 1'b0; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'bx; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b1; //0 means NO and 1 means YES
extCntrl_out = 1'bx; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'bxxxx; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}

{6'h0, 6'h8}: //jr
begin
regDst_out = 1'b1; //0 means RT and 1 means RD
ALUSrc_out = 1'bx; //0 means REG and 1 means IMM
memToReg_out = 1'bx; //0 means NO and 1 means YES
regWrite_out = 1'b0; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'bx; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b1; //0 means NO and 1 means YES
extCntrl_out = 1'bx; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'bxxxx; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}

{6'h3, 6'hx}: //jal
begin
regDst_out = 1'b0; //0 means RT and 1 means RD
ALUSrc_out = 1'b0; //0 means REG and 1 means IMM
memToReg_out = 1'b0; //0 means NO and 1 means YES
regWrite_out = 1'b0; //0 means NO and 1 means YES
memWrite_out = 1'b0; //0 means NO and 1 means YES
memRead_out = 1'b0; //0 means NO and 1 means YES
branch_out = 1'b0; //0 means NO and 1 means YES
jump_out = 1'b0; //0 means NO and 1 means YES
extCntrl_out = 1'b0; //0 means Zero-extension and 1 means Sign-extension
ALUCntrl_out = 4'b0010; //Refer to table on page 316 of the book

end // case: {6'hx, 6'hx}


///

default: //anything else
begin
regDst_out = 1'bx;
ALUSrc_out = 1'bx;
memToReg_out = 1'bx;
regWrite_out = 1'bx;
memWrite_out = 1'bx;
branch_out = 1'bx;
jump_out = 1'bx;
extCntrl_out = 1'bx;
ALUCntrl_out = 4'bxxxx;
end // case: default

endcase // casex({op_in, func_in})


end // always@ *

endmodule // MIPS_CONTROL




























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