module mem_tb;
	reg clock;
	reg RSTB;
	reg power1, power2;

	wire gpio;
        wire [15:0] checkbits;
	wire [37:0] mprj_io;
	wire flash_csb;
	wire flash_clk;
	wire flash_io0;
	wire flash_io1;

	assign checkbits = mprj_io[31:16];

	// External clock is used by default.  Make this artificially fast for the
	// simulation.  Normally this would be a slow clock and the digital PLL
	// would be the fast clock.

	always #10 clock <= (clock === 1'b0);

	initial begin
		clock = 0;
	end

	initial begin
		$dumpfile("mem.vcd");
		$dumpvars(0, mem_tb);

		// Repeat cycles of 1000 clock edges as needed to complete testbench
		repeat (100) begin
			repeat (1000) @(posedge clock);
			//$display("+1000 cycles");
		end
		$display("%c[1;31m",27);
		`ifdef GL
			$display ("Monitor: Timeout, Test MEM (GL) Failed");
		`else
			$display ("Monitor: Timeout, Test MEM (RTL) Failed");
		`endif
		$display("%c[0m",27);
		$finish;
	end

	initial begin
		RSTB <= 1'b0;
		#1000;
		RSTB <= 1'b1;	    // Release reset
		#2000;
	end

	initial begin		// Power-up sequence
		power1 <= 1'b0;
		power2 <= 1'b0;
		#200;
		power1 <= 1'b1;
		#200;
		power2 <= 1'b1;
	end

	always @(checkbits) begin
		if(checkbits == 16'hA040) begin
			$display("Mem Test (word rw) started");
		end
		else if(checkbits == 16'hAB40) begin
			$display("%c[1;31m",27);
			`ifdef GL
				$display("Monitor: Test MEM (GL) [word rw] failed");
			`else
				$display("Monitor: Test MEM (RTL) [word rw] failed");
			`endif
			$display("%c[0m",27);
			$finish;
		end
		else if(checkbits == 16'hAB41) begin
			`ifdef GL
				$display("Monitor: Test MEM (GL) [word rw]  passed");
			`else
				$display("Monitor: Test MEM (RTL) [word rw]  passed");
			`endif
		end
		else if(checkbits == 16'hA020) begin
			$display("Mem Test (short rw) started");
		end
		else if(checkbits == 16'hAB20) begin
			$display("%c[1;31m",27);
			`ifdef GL
				$display("Monitor: Test MEM (GL) [short rw] failed");
			`else
				$display("Monitor: Test MEM (RTL) [short rw] failed");
			`endif
			$display("%c[0m",27);
			$finish;
		end
		else if(checkbits == 16'hAB21) begin
			`ifdef GL
				$display("Monitor: Test MEM (GL) [short rw]  passed");
			`else
				$display("Monitor: Test MEM (RTL) [short rw]  passed");
			`endif
		end
		else if(checkbits == 16'hA010) begin
			$display("Mem Test (byte rw) started");
		end
		else if(checkbits == 16'hAB10) begin
			$display("%c[1;31m",27);
			`ifdef GL
				$display("Monitor: Test MEM (GL) [byte rw] failed");
			`else
				$display("Monitor: Test MEM (RTL) [byte rw] failed");
			`endif
			$display("%c[0m",27);
			$finish;
		end
		else if(checkbits == 16'hAB11) begin
			`ifdef GL
				$display("Monitor: Test MEM (GL) [byte rw] passed");
			`else
				$display("Monitor: Test MEM (RTL) [byte rw] passed");
			`endif
			$finish;
		end

	end

	wire VDD3V3;
	wire VDD1V8;
	wire VSS;

	assign VSS = 1'b0;
	assign VDD3V3 = power1;
	assign VDD1V8 = power2;

	assign mprj_io[3] = 1'b1;       // Force CSB high.

	caravel uut (
		.vddio	  (VDD3V3),
		.vssio	  (VSS),
		.vdda	  (VDD3V3),
		.vssa	  (VSS),
		.vccd	  (VDD1V8),
		.vssd	  (VSS),
		.vdda1    (VDD3V3),
		.vdda2    (VDD3V3),
		.vssa1	  (VSS),
		.vssa2	  (VSS),
		.vccd1	  (VDD1V8),
		.vccd2	  (VDD1V8),
		.vssd1	  (VSS),
		.vssd2	  (VSS),
		.clock	  (clock),
		.gpio     (gpio),
		.mprj_io  (mprj_io),
		.flash_csb(flash_csb),
		.flash_clk(flash_clk),
		.flash_io0(flash_io0),
		.flash_io1(flash_io1),
		.resetb	  (RSTB)
	);

	spiflash #(
		.FILENAME("mem.hex")
	) spiflash (
		.csb(flash_csb),
		.clk(flash_clk),
		.io0(flash_io0),
		.io1(flash_io1),
		.io2(),			// not used
		.io3()			// not used
	);

endmodule