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control.sv
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264 lines (249 loc) · 5.28 KB
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`timescale 1ns/10ps
module control (instru, BrTaken, UncondBr, overflow, zero, zero_hold, negative, cout,
Reg2Loc, RegWrite, MemWrite, MemToReg, ALUOp, ALUSrc,
ZEout, read_en, IsMOVZ, xfer_size, setFlag, isZero_accBr, isBLT, isMOV_ID);
input logic [31:0] instru;
input logic overflow, zero, zero_hold, negative, cout, isZero_accBr;
output logic BrTaken, UncondBr, Reg2Loc, RegWrite, MemWrite, MemToReg, ZEout, read_en, IsMOVZ, setFlag, isBLT, isMOV_ID;
output logic [3:0] xfer_size;
output logic [1:0] ALUSrc;
output logic [2:0] ALUOp;
logic Br_decision;
xor #0.05 (Br_decision, overflow, negative);
always_comb begin
casex (instru[31:21])
default: begin
RegWrite = 0;
isMOV_ID = 0;
end
// ADDI
11'b1001000100x: begin
ALUOp = 3'b010;
ALUSrc = 2'b10;
MemToReg = 0;
RegWrite = 1;
Reg2Loc = 1'bx;
MemWrite = 0;
UncondBr = 1'bx;
BrTaken = 0;
// new cntr signals
xfer_size = 4'bxxxx;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'bx;
setFlag = 1'b0;
isBLT = 1'b0;
isMOV_ID = 0;
end
// ADDS
11'b10101011000: begin
ALUOp = 3'b010;
ALUSrc = 2'b00;
MemToReg = 0;
RegWrite = 1;
Reg2Loc = 1'b1;
MemWrite = 0;
UncondBr = 1'bx;
BrTaken = 0;
// new cntr signals
xfer_size = 4'bxxxx;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'bx;
setFlag = 1'b1;
isBLT = 1'b0;
isMOV_ID = 0;
end
// B Imm26
11'b000101xxxxx: begin
ALUOp = 3'bxxx;
ALUSrc = 2'bxx;
MemToReg = 1'bx;
RegWrite = 0;
Reg2Loc = 1'bx;
MemWrite = 0;
UncondBr = 1'b1;
BrTaken = 1;
// new cntr signals
xfer_size = 4'bxxxx;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'bx;
setFlag = 1'b0;
isBLT = 1'b0;
isMOV_ID = 0;
end
// B.LT
11'b01010100xxx: begin
ALUOp = 3'bxxx;
ALUSrc = 2'bxx;
MemToReg = 1'bx;
RegWrite = 0;
Reg2Loc = 1'bx;
MemWrite = 0;
UncondBr = 1'b0;
BrTaken = Br_decision;
// new cntr signals
xfer_size = 4'bxxxx;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'bx;
setFlag = 1'b0;
isBLT = 1'b1;
isMOV_ID = 0;
end
// CBZ Rd, Imm19
11'b10110100xxx: begin
ALUOp = 3'b000;
ALUSrc = 2'b00;
MemToReg = 1'bx;
RegWrite = 0;
Reg2Loc = 1'b0;
MemWrite = 0;
UncondBr = 1'b0;
BrTaken = isZero_accBr;
// new cntr signals
xfer_size = 4'bxxxx;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'bx;
setFlag = 1'b0;
isBLT = 1'b0;
isMOV_ID = 0;
end
// LDUR
11'b11111000010: begin
ALUOp = 3'b010;
ALUSrc = 2'b01;
MemToReg = 1;
RegWrite = 1;
Reg2Loc = 1'bx;
MemWrite = 0;
UncondBr = 1'bx;
BrTaken = 0;
// new cntr signals
xfer_size = 4'b1000;
ZEout = 1'b0;
read_en = 1;
IsMOVZ = 1'bx;
setFlag = 1'b0;
isBLT = 1'b0;
isMOV_ID = 0;
end
// LDURB
11'b00111000010: begin
ALUOp = 3'b010;
ALUSrc = 2'b01;
MemToReg = 1;
RegWrite = 1;
Reg2Loc = 1'bx;
MemWrite = 0;
UncondBr = 1'bx;
BrTaken = 0;
// new cntr signals
xfer_size = 4'b0001;
ZEout = 1'b1;
read_en = 1;
IsMOVZ = 1'bx;
setFlag = 1'b0;
isBLT = 1'b0;
isMOV_ID = 0;
end
// MOVK
11'b111100101xx: begin
ALUOp = 3'b000;
ALUSrc = 2'b11;
MemToReg = 0;
RegWrite = 1;
Reg2Loc = 1'b0;
MemWrite = 0;
UncondBr = 1'bx;
BrTaken = 0;
// new cntr signals
xfer_size = 4'bxxxx;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'b0; // do movk path
setFlag = 1'b0;
isBLT = 1'b0;
isMOV_ID = 1;
end
// MOVZ
11'b110100101xx: begin
ALUOp = 3'b000;
ALUSrc = 2'b11;
MemToReg = 0;
RegWrite = 1;
Reg2Loc = 1'b0;
MemWrite = 0;
UncondBr = 1'bx;
BrTaken = 0;
// new cntr signals
xfer_size = 4'bxxxx;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'b1;
setFlag = 1'b0;
isBLT = 1'b0;
isMOV_ID = 1;
end
// STUR
11'b11111000000: begin
ALUOp = 3'b010;
ALUSrc = 2'b01;
MemToReg = 1'bx;
RegWrite = 0;
Reg2Loc = 1'b0;
MemWrite = 1;
UncondBr = 1'bx;
BrTaken = 0;
// new cntr signals
xfer_size = 4'b1000;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'bx;
setFlag = 1'b0;
isBLT = 1'b0;
isMOV_ID = 0;
end
// STURB
11'b00111000000: begin
ALUOp = 3'b010;
ALUSrc = 2'b01;
MemToReg = 1'bx;
RegWrite = 0;
Reg2Loc = 1'b0;
MemWrite = 1;
UncondBr = 1'bx;
BrTaken = 0;
// new cntr signals
xfer_size = 4'b0001;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'bx;
setFlag = 1'b0;
isBLT = 1'b0;
isMOV_ID = 0;
end
// SUBS
11'b11101011000: begin
ALUOp = 3'b011;
ALUSrc = 2'b00;
MemToReg = 0;
RegWrite = 1;
Reg2Loc = 1'b1;
MemWrite = 0;
UncondBr = 1'bx;
BrTaken = 0;
// new cntr signals
xfer_size = 4'bxxxx;
ZEout = 1'bx;
read_en = 0;
IsMOVZ = 1'bx;
setFlag = 1'b1;
isBLT = 1'b0;
isMOV_ID = 0;
end
endcase
end
endmodule