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Reordered case statement by opcode and improved comment labels

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WilliamMiceli
2019-03-29 16:17:27 -04:00
parent 445f5ce830
commit 93469aa23f
1 changed files with 202 additions and 185 deletions
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387
lab2CA.srcs/sources_1/new/ControlUnit.v
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@@ -15,9 +15,73 @@ module ControlUnit(
always @(instIn, functBit)begin
case(instIn)
4'b0101:
if(functBit == 1) begin
aluOut <= 4'b0001; //sub
4'b0000: // Halt/NOP
begin
halt <= 1'b1;
RegEn <= 1'b1;
FU <= 3'b001; // Disable Branching
addi <= 1'b0;
aluOut <= 4'b0000;
mem <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b0001: // Load Byte
begin
aluOut <= 4'b0000;
mem <= 1'b1;
dataMemEn <= 1'b0;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
addi <= 1'b0;
halt <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b0010: // Store Byte
begin
aluOut <= 4'b0000;
mem <= 1'b0;
dataMemEn <= 1'b1;
RegEn <= 1'b1;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
addi <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b0011: // Link
begin
halt <= 1'b0;
RegEn <= 1'b0;
FU <= 3'b001;
addi <= 1'b0;
aluOut <= 4'b0000;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b1;
bank <= 2'b10;
js <= 1'b0;
end
4'b0100: // Zero
begin
aluOut <= 4'b1011;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b0101: // Add/Subtract
if(functBit == 1) begin // Subtract
aluOut <= 4'b0001;
RegEn <= 1'b0;
FU <= 3'b001;
halt <= 1'b0;
@@ -28,8 +92,8 @@ module ControlUnit(
bank <= 2'b10;
js <= 1'b0;
end
else begin
aluOut <= 4'b0000; //Add
else begin // Add
aluOut <= 4'b0000;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
@@ -40,33 +104,22 @@ module ControlUnit(
bank <= 2'b10;
js <= 1'b0;
end
4'b1101: begin
aluOut <= 4'b0011; //nor
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b0100: begin
aluOut <= 4'b1011; //zero
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b1110:
if(functBit == 1) begin
aluOut <= 4'b0100; //and
4'b0110: // Add Immediate
begin
aluOut <= 4'b1010;
addi <= 1'b1;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b0111: // Set if Less Than
begin
aluOut <= 4'b1001;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
@@ -77,8 +130,100 @@ module ControlUnit(
bank <= 2'b10;
js <= 1'b0;
end
else begin
aluOut <= 4'b0010; //or
4'b1000: // Jump to Register
begin
aluOut <= 4'b0000;
FU <= 3'b000;
RegEn <= 1'b1;
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b1001: // Jump Forward
begin
aluOut <= 4'b0000;
FU <= 3'b010;
RegEn <= 1'b1;
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b1010: // Bank Load/Bank Store
begin
halt <= 1'b0;
RegEn <= !functBit;
FU <= 3'b001; // Disable Branching
addi <= 1'b0;
aluOut <= 4'b0000;
mem <= 1'b0;
link <= 1'b0;
bank <= {functBit,functBit};
js <= 1'b0;
end
4'b1011: // Jump Backward
begin
aluOut <= 4'b0000;
FU <= 3'b010;
RegEn <= 1'b1;
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b1;
end
4'b1100: // Branch if Zero
begin
aluOut <= 4'b1010;
FU <= 3'b110;
RegEn <= 1'b1;
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b1101: // NOR
begin
aluOut <= 4'b0011;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b1110: // OR/AND
if(functBit == 1) // AND
begin
aluOut <= 4'b0100;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
else // OR
begin
aluOut <= 4'b0010;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
@@ -89,9 +234,10 @@ module ControlUnit(
bank <= 2'b10;
js <= 1'b0;
end
4'b1111:
if(functBit == 1) begin
aluOut <= 4'b0110; //srl
4'b1111: // Shift Right Logical/Shift Left Logical
if(functBit == 1) // Shift Right Logical
begin
aluOut <= 4'b0110;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
@@ -102,8 +248,9 @@ module ControlUnit(
bank <= 2'b10;
js <= 1'b0;
end
else begin
aluOut <= 4'b0101; //shift left
else // Shift Left Logical
begin
aluOut <= 4'b0101;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
@@ -114,161 +261,31 @@ module ControlUnit(
bank <= 2'b10;
js <= 1'b0;
end
4'b0111: begin
aluOut <= 4'b1001; //Less than
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
default:
begin
halt <= 1'b1;
RegEn <= 1'b1;
FU <= 3'b001;
addi <= 1'b0;
aluOut <= 4'b0000;
mem <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b0110: begin
aluOut <= 4'b1010;
addi <= 1'b1; // addi
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b1001: begin
aluOut <= 4'b0000;
FU <= 3'b010; // jf
RegEn <= 1'b1;
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b1011: begin
aluOut <= 4'b0000;
FU <= 3'b010; // jb
RegEn <= 1'b1;
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b1;
end
4'b0011: begin // link
halt <= 1'b0;
RegEn <= 1'b0;
FU <= 3'b001;
addi <= 1'b0;
aluOut <= 4'b0000;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b1;
bank <= 2'b10;
js <= 1'b0;
end
4'b1100: begin
aluOut <= 4'b1010;
FU <= 3'b110; // branch
RegEn <= 1'b1;
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b1000: begin
aluOut <= 4'b0000;
FU <= 3'b000; // jumpreg
RegEn <= 1'b1;
halt <= 1'b0;
addi <= 1'b0;
mem <= 1'b0;
dataMemEn <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b0001: begin
aluOut <= 4'b0000;
mem <= 1'b1; // load
dataMemEn <= 1'b0;
RegEn <= 1'b0;
FU <= 3'b001; // Disable Branching
addi <= 1'b0;
halt <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b0010: begin
aluOut <= 4'b0000;
mem <= 1'b0; // store
dataMemEn <= 1'b1;
RegEn <= 1'b1;
FU <= 3'b001; // Disable Branching
halt <= 1'b0;
addi <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
4'b1010: begin
halt <= 1'b0; // bank
RegEn <= !functBit;
FU <= 3'b001; // Disable Branching
addi <= 1'b0;
aluOut <= 4'b0000;
mem <= 1'b0;
link <= 1'b0;
bank <= {functBit,functBit};
js <= 1'b0;
end
4'b0000: begin
halt <= 1'b1; // halt
RegEn <= 1'b1;
FU <= 3'b001; // Disable Branching
addi <= 1'b0;
aluOut <= 4'b0000;
mem <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
default: begin
halt <= 1'b1;
RegEn <= 1'b1;
FU <= 3'b001;
addi <= 1'b0;
aluOut <= 4'b0000;
mem <= 1'b0;
link <= 1'b0;
bank <= 2'b10;
js <= 1'b0;
end
endcase
end
endmodule
module ControlUnit_tb();
reg [3:0] instruction;
reg functionB;
wire [3:0] aluOutput;
wire [2:0] FetchUnit;
wire addImmediate;
wire memory;
wire RegEnable;
wire addImmediate, memory, RegEnable;
ControlUnit ControlUnit0(
.instIn(instruction),