9086/system/system.v

`timescale 1ns/1ps


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);
processor p(clock,reset,address_bus,data_bus,rd,wr,BHE,IOMEM,HALT,ERROR);

doublemem sysmem(address_bus,data_bus,rd,wr,BHE,IOMEM);

string waveform_name;
initial begin
	if($value$plusargs("WAVEFORM=%s",waveform_name))begin
		$dumpfile(waveform_name);
		$dumpvars(0,p);
	end
end

reg [1:0] finish;

string memdump_name;
always @(posedge HALT) begin
	$display("Processor halted.\nCycles run for: %d",cycles-1);
	if($value$plusargs("MEMDUMP=%s",memdump_name))begin
		$writememh(memdump_name, sysmem.memory,0,32767);
	end
	finish<=2'd1;
end

always @(posedge clock) begin
	/* Allow some clock cycles for the waveform*/
	case(finish)
		2'd0: begin end
		2'd1: finish <= 2;
		2'd2: finish <= 3;
		2'd3: $finish;
	endcase
end

always @(posedge ERROR) begin
	$display("PROCESSOR RUN INTO AN ERROR.\nCycles run for: %d",cycles-1);
	if($value$plusargs("MEMDUMP=%s",memdump_name))begin
		$writememh(memdump_name, system.sysmem.memory,0,32767);
	end
	finish<=2'd1;
end

integer cycles=0;

always @(posedge clock)begin
	if(reset==1)
		cycles<=cycles+1;
	else
		cycles<=0;
end


endmodule