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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: ITU Computer Engineering Department
// Engineer: Omur F Erzurumluoglu
// Project Name: BLG222E Project 2 Simulation
//////////////////////////////////////////////////////////////////////////////////
module CPUSystemSimulation();
wire [11:0] T;
integer test_no;
wire clock;
wire reset;
wire[5:0] Opcode;
wire[1:0] RegSel;
wire[7:0] Address;
wire[2:0] DestReg;
wire[2:0] SrcReg1;
wire[2:0] SrcReg2;
CrystalOscillator clk();
ResetGenerator rg();
CPUSystem CPUSys(
.Clock(clk.clock),
.Reset(rg.reset),
.T(T)
);
FileOperation F();
assign clock = clk.clock;
assign reset = rg.reset;
task ClearRegisters;
begin
CPUSys.ALUSys.RF.R1.Q = 32'h0;
CPUSys.ALUSys.RF.R2.Q = 32'h0;
CPUSys.ALUSys.RF.R3.Q = 32'h0;
CPUSys.ALUSys.RF.R4.Q = 32'h0;
CPUSys.ALUSys.RF.S1.Q = 32'h0;
CPUSys.ALUSys.RF.S2.Q = 32'h0;
CPUSys.ALUSys.RF.S3.Q = 32'h0;
CPUSys.ALUSys.RF.S4.Q = 32'h0;
CPUSys.ALUSys.ARF.PC.Q = 16'h0;
CPUSys.ALUSys.ARF.AR.Q = 16'h0;
CPUSys.ALUSys.ARF.SP.Q = 16'h00FF;
CPUSys.ALUSys.IR.IROut = 16'h0;
CPUSys.ALUSys.DR.DROut = 32'h0;
CPUSys.ALUSys.ALU.FlagsOut = 4'b0000;
end
endtask
task SetRegisters16;
input [15:0] value;
begin
CPUSys.ALUSys.ARF.PC.Q = value;
CPUSys.ALUSys.ARF.AR.Q = value;
CPUSys.ALUSys.ARF.SP.Q = value;
CPUSys.ALUSys.IR.IROut = value;
end
endtask
task SetRegisters32;
input [31:0] value;
begin
CPUSys.ALUSys.RF.R1.Q = value;
CPUSys.ALUSys.RF.R2.Q = value;
CPUSys.ALUSys.RF.R3.Q = value;
CPUSys.ALUSys.RF.R4.Q = value;
CPUSys.ALUSys.RF.S1.Q = value;
CPUSys.ALUSys.RF.S2.Q = value;
CPUSys.ALUSys.RF.S3.Q = value;
CPUSys.ALUSys.RF.S4.Q = value;
CPUSys.ALUSys.DR.DROut = value;
end
endtask
task DisableAll;
begin
CPUSys.RF_RegSel = 4'b0000;
CPUSys.RF_ScrSel = 4'b0000;
CPUSys.ARF_RegSel = 3'b000;
CPUSys.IR_Write = 0;
CPUSys.ALU_WF = 0;
CPUSys.Mem_CS = 1;
CPUSys.Mem_WR = 0;
CPUSys.DR_E = 0;
CPUSys.T_Reset = 1; // T_Reset is used to reset T of CPUSys
end
endtask
task ResetT;
begin
CPUSys.T_Reset = 1;
end
endtask
assign Opcode = CPUSys.Opcode;
assign RegSel = CPUSys.RegSel;
assign Address = CPUSys.Address;
assign DestReg = CPUSys.DestReg;
assign SrcReg1 = CPUSys.SrcReg1;
assign SrcReg2 = CPUSys.SrcReg2;
initial begin
F.SimulationName ="CPUSystem";
F.InitializeSimulation(0);
clk.clock = 0;
//Test 1
test_no = 1;
DisableAll();
ClearRegisters();
SetRegisters32(32'h77777777);
F.CheckValues(CPUSys.ALUSys.RF.R2.Q, 32'h77777777, test_no, "R2");
rg.ActivateReset();
clk.Clock();
rg.DeactivateReset();
F.CheckValues(CPUSys.ALUSys.RF.R2.Q, 32'h00000000, test_no, "R2");
CPUSys.ALUSys.ARF.PC.Q = 16'h0056;
//Test 2 MOVL R1, 0x01
test_no = 2;
CPUSys.ALUSys.IR.IROut = 16'h6401;
CPUSys.T = 12'b0000_0000_0100;
while (CPUSys.T != 12'b0000_0000_0001) begin
clk.Clock();
end
F.CheckValues(CPUSys.ALUSys.RF.R1.Q, 32'h00000001, test_no, "R1");
F.CheckValues(CPUSys.ALUSys.ALU.FlagsOut[3], 0, test_no, "Z");
//Test 3 DEC R1, R2
test_no = 3;
CPUSys.ALUSys.IR.IROut = 16'h2AC0;
CPUSys.T = 12'b0000_0000_0100;
while (CPUSys.T != 12'b0000_0000_0001) begin
clk.Clock();
end
F.CheckValues(CPUSys.ALUSys.RF.R1.Q, 32'h00000001, test_no, "R1");
F.CheckValues(CPUSys.ALUSys.RF.R2.Q, 32'h00000000, test_no, "R2");
F.CheckValues(CPUSys.ALUSys.ALU.FlagsOut[3], 1, test_no, "Z");
//Test 4 LDAL R3, 0x00
test_no = 4;
CPUSys.ALUSys.IR.IROut = 16'h7A00;
CPUSys.T = 12'b0000_0000_0100;
while (CPUSys.T != 12'b0000_0000_0001) begin
clk.Clock();
end
F.CheckValues(CPUSys.ALUSys.DR.DROut, 32'h00000600, test_no, "DROut");
F.CheckValues(CPUSys.ALUSys.RF.R3.Q, 32'h00000600, test_no, "R3");
F.CheckValues(CPUSys.ALUSys.ARF.AR.Q, 16'h0001, test_no, "AR");
//Test 5 LDAH R3, 0x00
test_no = 5;
CPUSys.ALUSys.IR.IROut = 16'h7E00;
CPUSys.T = 12'b0000_0000_0100;
while (CPUSys.T != 12'b0000_0000_0001) begin
clk.Clock();
end
F.CheckValues(CPUSys.ALUSys.DR.DROut, 32'h06000a08, test_no, "DROut");
F.CheckValues(CPUSys.ALUSys.RF.R3.Q, 32'h06000a08, test_no, "R3");
F.CheckValues(CPUSys.ALUSys.ARF.AR.Q, 16'h0003, test_no, "AR");
//Test 6 STAR R3
test_no = 6;
CPUSys.ALUSys.IR.IROut = 16'h7460;
CPUSys.T = 12'b0000_0000_0100;
CPUSys.ALUSys.ARF.AR.Q = 16'h0008;
while (CPUSys.T != 12'b0000_0000_0001) begin
clk.Clock();
end
F.CheckValues(CPUSys.ALUSys.RF.R3.Q, 32'h06000a08, test_no, "R3");
F.CheckValues(CPUSys.ALUSys.ARF.AR.Q, 16'h000b, test_no, "AR");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'h08],8'h06, test_no, "MEM[AR]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'h09],8'h00, test_no, "MEM[AR]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'h0A],8'h0A, test_no, "MEM[AR]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'h0B],8'h08, test_no, "MEM[AR]");
//Test 7 CALL 0x32
test_no = 7;
CPUSys.ALUSys.IR.IROut = 16'h1C32;
CPUSys.T = 12'b0000_0000_0100;
CPUSys.ALUSys.ARF.PC.Q = 16'hAABB;
CPUSys.ALUSys.ARF.SP.Q = 16'h00FF;
while (CPUSys.T != 12'b0000_0000_0001) begin
clk.Clock();
end
F.CheckValues(CPUSys.ALUSys.ARF.PC.Q, 16'h0032, test_no, "PC");
F.CheckValues(CPUSys.ALUSys.ARF.SP.Q, 16'h00FD, test_no, "SP");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hFE],8'hAA, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hFF],8'hBB, test_no, "MEM[SP]");
//Test 8 ORR R1, R1, AR
test_no = 8;
CPUSys.ALUSys.IR.IROut = 16'h4A46;
CPUSys.T = 12'b0000_0000_0100;
CPUSys.ALUSys.RF.R1.Q = 32'h000000FC;
CPUSys.ALUSys.ARF.AR.Q = 16'h0012;
while (CPUSys.T != 12'b0000_0000_0001) begin
clk.Clock();
end
F.CheckValues(CPUSys.ALUSys.RF.R1.Q, 32'h000000FE, test_no, "R1");
F.CheckValues(CPUSys.ALUSys.ARF.AR.Q, 16'h0012, test_no, "AR");
F.FinishSimulation();
end
endmodule