142 lines
3.6 KiB
Verilog
142 lines
3.6 KiB
Verilog
/* system.v - A basic test system with memory and IO for the 9086 CPU
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This file is part of the 9086 project.
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Copyright (c) 2023 Efthymios Kritikos
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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`timescale 1ns/1ps
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`include "config.v"
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module system ( input clock,input reset, output [19:0]address_bus, inout [15:0]data_bus,output BHE, output rd, output wr, output IOMEM, output HALT, output ERROR);
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`ifdef CALCULATE_IPC
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wire new_instruction;
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`endif
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`ifdef OUTPUT_JSON_STATISTICS
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wire jump;
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`endif
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processor p(
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/* MISC */ clock,reset,HALT,ERROR
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/* MEMORY / IO */ ,address_bus,data_bus,rd,wr,BHE,IOMEM
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`ifdef CALCULATE_IPC
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/* STATISTICS */ ,new_instruction
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`endif
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`ifdef OUTPUT_JSON_STATISTICS
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/* */ , jump
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`endif
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);
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doublemem sysmem(address_bus,data_bus,rd,wr,BHE,IOMEM);
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`ifdef OUTPUT_JSON_STATISTICS
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string stats_name;
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integer json_file_descriptor;
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`endif
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string waveform_name;
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initial begin
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if($value$plusargs("WAVEFORM=%s",waveform_name))begin
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$dumpfile(waveform_name);
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$dumpvars(0,p);
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end
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`ifdef OUTPUT_JSON_STATISTICS
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if($value$plusargs("STATS=%s",stats_name))begin
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json_file_descriptor=$fopen(stats_name,"w");
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$fdisplay(json_file_descriptor,"{\n\"L1_size\":0,\n\"Cycles\":[");
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first_json_cycle = 1;
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end else
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json_file_descriptor=0;
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`endif
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end
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`ifdef OUTPUT_JSON_STATISTICS
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reg first_json_cycle;
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always @(negedge clock)begin
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if(HALT==0 && json_file_descriptor!=0)begin
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$fdisplay(json_file_descriptor,"%s{\"C\":%0d,\"JMP\":%0d}",first_json_cycle?"":",",cycles,jump);
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first_json_cycle <= 0;
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end
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end
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`endif
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always @(negedge wr) begin
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if(IOMEM==1'b1 && address_bus[7:0]==8'hA5 )
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$write("%s" ,data_bus[15:8]);
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end
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`ifdef CALCULATE_IPC
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reg [128:0] instruction_count;
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always @(new_instruction) begin
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instruction_count<=instruction_count+1;
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end
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`endif
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reg [1:0] finish;
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string memdump_name;
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always @(posedge HALT) begin
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if($value$plusargs("MEMDUMP=%s",memdump_name))begin
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$writememh(memdump_name, sysmem.memory,0,32767);
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end
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finish<=2'd1;
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end
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always @(posedge clock) begin
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/* Allow some clock cycles for the waveform*/
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case(finish)
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2'd0: begin end
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2'd1: begin
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finish <= 2;
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$display("\x1b[7mProcessor halted.\nCycles run for : %0d\x1b[m",cycles);
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`ifdef CALCULATE_IPC
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$display("\x1b[7mInstr. per cycle : %f\x1b[m", $itor(instruction_count) / $itor(cycles) );
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`endif
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`ifdef OUTPUT_JSON_STATISTICS
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if(json_file_descriptor!=0)
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$fdisplay(json_file_descriptor,"],\n\"Total Cycles\":%0d,\n\"Instructions run\":%0d\n}",cycles,instruction_count);
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`endif
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end
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2'd2: finish <= 3;
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2'd3: $finish;
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endcase
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end
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always @(posedge ERROR) begin
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$display("PROCESSOR RUN INTO AN ERROR.\nCycles run for: %d",cycles-1);
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if($value$plusargs("MEMDUMP=%s",memdump_name))begin
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$writememh(memdump_name, system.sysmem.memory,0,32767);
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end
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finish<=2'd1;
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end
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reg [128:0] cycles=0;
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always @(negedge clock)begin
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if(reset==1)
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cycles<=cycles+1;
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else begin
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cycles<=0;
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`ifdef CALCULATE_IPC
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instruction_count <= 0;
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`endif
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end
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end
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endmodule
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