picorv32/testbench_wb.v

`timescale 1 ns / 1 ps

`ifndef VERILATOR
module testbench #(
	parameter VERBOSE = 0
);
	reg clk = 1;
	reg resetn = 1;
	wire trap;

	always #5 clk = ~clk;

	initial begin
		repeat (100) @(posedge clk);
		resetn <= 0;
	end

	initial begin
		if ($test$plusargs("vcd")) begin
			$dumpfile("testbench.vcd");
			$dumpvars(0, testbench);
		end
		repeat (1000000) @(posedge clk);
		$display("TIMEOUT");
		$finish;
	end

	wire trace_valid;
	wire [35:0] trace_data;
	integer trace_file;

	initial begin
		if ($test$plusargs("trace")) begin
			trace_file = $fopen("testbench.trace", "w");
			repeat (10) @(posedge clk);
			while (!trap) begin
				@(posedge clk);
				if (trace_valid)
					$fwrite(trace_file, "%x\n", trace_data);
			end
			$fclose(trace_file);
			$display("Finished writing testbench.trace.");
		end
	end

	picorv32_wrapper #(
		.VERBOSE (VERBOSE)
	) top (
		.wb_clk(clk),
		.wb_rst(resetn),
		.trap(trap),
		.trace_valid(trace_valid),
		.trace_data(trace_data)
	);
endmodule
`endif

module picorv32_wrapper #(
	parameter VERBOSE = 0
) (
	input wb_clk,
	input wb_rst,
	output trap,
	output trace_valid,
	output [35:0] trace_data
);
	wire exit;
	reg [31:0] irq = 0;
	wire mem_instr;

	reg [15:0] count_cycle = 0;
	always @(posedge wb_clk) count_cycle <= !wb_rst ? count_cycle + 1 : 0;

	always @* begin
		irq = 0;
		irq[4] = &count_cycle[12:0];
		irq[5] = &count_cycle[15:0];
	end

	wire [31:0] wb_m2s_adr;
	wire [31:0] wb_m2s_dat;
	wire [3:0] wb_m2s_sel;
	wire wb_m2s_we;
	wire wb_m2s_cyc;
	wire wb_m2s_stb;
	wire [31:0] wb_s2m_dat;
	wire wb_s2m_ack;

	picorv32_wb #(
`ifndef SYNTH_TEST
`ifdef SP_TEST
		.ENABLE_REGS_DUALPORT(0),
`endif
`ifdef COMPRESSED_ISA
		.COMPRESSED_ISA(1),
`endif
		.ENABLE_MUL(1),
		.ENABLE_DIV(1),
		.ENABLE_IRQ(1),
		.ENABLE_TRACE(1)
`endif
	) uut (
		.trap (trap),
		.exit(exit),
		.irq (irq),
		.trace_valid (trace_valid),
		.trace_data (trace_data),
		.mem_instr(mem_instr),

		.wb_clk_i(wb_clk),
		.wb_rst_i(wb_rst),
	);

	reg [1023:0] firmware_file;
	initial begin
		if (!$value$plusargs("firmware=%s", firmware_file))
			firmware_file = "firmware/firmware.hex";
		$readmemh(firmware_file, uut.memory);
	end

	integer cycle_counter;
	always @(posedge wb_clk) begin
		cycle_counter <= !wb_rst ? cycle_counter + 1 : 0;
		if (!wb_rst && trap) begin
`ifndef VERILATOR
			repeat (10) @(posedge wb_clk);
`endif
			$display("TRAP after %1d clock cycles", cycle_counter);
			if (exit) begin
				$display("ALL TESTS PASSED.");
				$finish;
			end else begin
				$display("ERROR!");
				if ($test$plusargs("noerror"))
					$finish;
				$stop;
			end
		end
	end
endmodule