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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: ITU Computer Engineering Department
// Engineer: Omur F Erzurumluoglu
// Project Name: BLG222E Project 2 Simulation
//////////////////////////////////////////////////////////////////////////////////
module CPUSystemSimulation_Factorial();
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_no = 1;
DisableAll();
ClearRegisters();
// Code to calculate Factorial
// MOVL R2, 0x01 # 26 0x6501 # R2 is used for result
// MOVL R1, 0x04 # 28 0x6404 # R1 is used for iteration number
// MOV R1, R1 # 2A 0x6240 # to pass through ALU
// CALL FACTORIAL # 2C 0x1C32
// STA R2, 0x54 # 2E 0x8154 # M[ADDRESS] � R2
// BRA FINISH # 30 0x0052
// FACTORIAL BEQ END_F # 32 0x0844 # If R1 == 0, return
// MOVL R3, 0x01 # 34 0x6601
// SUB R3, R1, R3 # 36 0x5F4C
// BEQ END_F # 38 0x0844 # If R1 == 1, return
// PSHL R1 # 3A 0x1000
// DEC R1, R1 # 3C 0x2A40
// CALL FACTORIAL # 3E 0x1C32 # recursive
// POPL R4 # 40 0x0F00
// CALL MULTIPLY # 42 0x1C46
// END_F RET # 44 0x2000
// MULTIPLY MOV R3, R2 # 46 0x6350 # for R2 � R2*R4
// DEC R4, R4 # 48 0x2BF0
// M_LOOP ADD R2, R2, R3 # 4A 0x56DC # R4 times R2 � R2 + R3
// DEC R4, R4 # 4C 0x2BF0
// BNE M_LOOP # 4E 0x044A
// RET # 50 0x2000
// FINISH # 52 NOOP
CPUSys.ALUSys.ARF.PC.Q = 16'h0026;
while (test_no <= 69) begin
clk.Clock();
if (CPUSys.T == 12'b0000_0000_0001)
test_no = test_no + 1;
end
F.CheckValues(CPUSys.ALUSys.IROut,16'h0052, test_no, "IROut");
F.CheckValues(CPUSys.ALUSys.ARF.PC.Q, 16'h0052, test_no, "PC");
F.CheckValues(CPUSys.ALUSys.ARF.SP.Q, 16'h00FF, test_no, "SP");
F.CheckValues(CPUSys.ALUSys.ARF.AR.Q, 16'h0057, test_no, "AR");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'h54],8'h00, test_no, "MEM[ADDRESS]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'h55],8'h00, test_no, "MEM[ADDRESS]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'h56],8'h00, test_no, "MEM[ADDRESS]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'h57],8'h18, test_no, "MEM[ADDRESS]");
F.CheckValues(CPUSys.ALUSys.RF.R1.Q,32'h00000001, test_no, "R1");
F.CheckValues(CPUSys.ALUSys.RF.R2.Q,32'h00000018, test_no, "R2");
F.CheckValues(CPUSys.ALUSys.RF.R3.Q,32'h00000006, test_no, "R3");
F.CheckValues(CPUSys.ALUSys.RF.R4.Q,32'h00000000, test_no, "R4");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hF2],8'h00, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hF3],8'h40, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hF4],8'h00, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hF5],8'h44, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hF6],8'h00, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hF7],8'h40, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hF8],8'h00, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hF9],8'h44, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hFA],8'h00, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hFB],8'h40, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hFC],8'h00, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hFD],8'h44, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hFE],8'h00, test_no, "MEM[SP]");
F.CheckValues(CPUSys.ALUSys.MEM.RAM_DATA[8'hFF],8'h2E, test_no, "MEM[SP]");
F.FinishSimulation();
end
endmodule