verilog/dv/usb2uart/usb2uart_tb.v - third_party/shuttle/sky130/mpw-008/slot-006 - Git at Google

 // SPDX-FileCopyrightText: 2020 Efabless Corporation
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 // SPDX-License-Identifier: Apache-2.0

 `default_nettype wire

 `timescale 1 ns / 1 ps

 module usb2uart_tb;

 	// Testbench uses a 48 MHz clock
 	// Want to interface to 115200 baud UART
 	parameter c_CLOCK_MHZ       = 48;
 	parameter c_UART_SPEED      = 115200;

 	parameter c_CLOCK_PERIOD_NS = 1000/c_CLOCK_MHZ;
 	parameter c_CLKS_PER_BIT    = c_CLOCK_MHZ*1000000/c_UART_SPEED;
 	parameter c_BIT_PERIOD      = c_CLKS_PER_BIT*c_CLOCK_PERIOD_NS;

 	integer i;
 	integer j;
 	integer k;

     // Signals declaration
     reg clock;
     reg RSTB;
     reg power1, power2;
     reg CSB;
     wire gpio;
     wire [37:0] mprj_io;

 	reg user_uart_rx;
 /*
 	wire mgmt_uart_tx;
 	assign mgmt_uart_tx = mprj_io[6];
 */
     // Signals Assignment
 	assign mprj_io[34] = user_uart_rx;

     always #(c_CLOCK_PERIOD_NS/2) clock <= (clock === 1'b0);

     initial begin
         clock = 0;
     end

     `ifdef ENABLE_SDF
 		initial begin
 			$sdf_annotate("../../../sdf/user_proj_example.sdf", uut.mprj.mprj) ;
 			$sdf_annotate("../../../mgmt_core_wrapper/sdf/DFFRAM.sdf", uut.soc.DFFRAM_0) ;
 			$sdf_annotate("../../../mgmt_core_wrapper/sdf/mgmt_core.sdf", uut.soc.core) ;
 			$sdf_annotate("../../../caravel/sdf/housekeeping.sdf", uut.housekeeping) ;
 			$sdf_annotate("../../../caravel/sdf/chip_io.sdf", uut.padframe) ;
 			$sdf_annotate("../../../caravel/sdf/mprj_logic_high.sdf", uut.mgmt_buffers.mprj_logic_high_inst) ;
 			$sdf_annotate("../../../caravel/sdf/mprj2_logic_high.sdf", uut.mgmt_buffers.mprj2_logic_high_inst) ;
 			$sdf_annotate("../../../caravel/sdf/mgmt_protect_hv.sdf", uut.mgmt_buffers.powergood_check) ;
 			$sdf_annotate("../../../caravel/sdf/mgmt_protect.sdf", uut.mgmt_buffers) ;
 			$sdf_annotate("../../../caravel/sdf/caravel_clocking.sdf", uut.clocking) ;
 			$sdf_annotate("../../../caravel/sdf/digital_pll.sdf", uut.pll) ;
 			$sdf_annotate("../../../caravel/sdf/xres_buf.sdf", uut.rstb_level) ;
 			$sdf_annotate("../../../caravel/sdf/user_id_programming.sdf", uut.user_id_value) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_1[0] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_1[1] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_2[0] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_2[1] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_2[2] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[0] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[1] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[2] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[3] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[4] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[5] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[6] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[7] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[8] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[9] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[10] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[0] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[1] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[2] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[3] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[4] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[5] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[0] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[1] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[2] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[3] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[4] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[5] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[6] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[7] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[8] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[9] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[10] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[11] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[12] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[13] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[14] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[15] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_0[0] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_0[1] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_2[0] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_2[1] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_2[2] ) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_5) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_6) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_7) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_8) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_9) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_10) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_11) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_12) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_13) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_14) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_15) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_16) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_17) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_18) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_19) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_20) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_21) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_22) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_23) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_24) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_25) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_26) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_27) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_28) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_29) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_30) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_31) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_32) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_33) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_34) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_35) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_36) ;
 			$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_37) ;
 		end
 	`endif

     initial begin
         $dumpfile("usb2uart.vcd");
         $dumpvars(0, usb2uart_tb);
 		//$monitor("usb2uart.in_data: 0x%x", uut.mprj.mprj.usb2uart.in_data);

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

 	// Write a byte to RX pin
 	task UART_WRITE_RX_AND_RCV;
 		input [7:0] i_Data;
 		integer     ii;
 	begin
 		wait(uut.mprj.mprj.usb2uart.in_ready == 1);

 		// Write Start Bit
 		#(c_BIT_PERIOD) user_uart_rx <= 1'b0;

 		// Write Data
 		for (ii=0; ii<8; ii=ii+1)
 		begin
 			#(c_BIT_PERIOD) user_uart_rx <= i_Data[ii];
 		end

 		// Write Stop Bit
 		#(c_BIT_PERIOD) user_uart_rx <= 1'b1;

 		//@(posedge uut.mprj.mprj.usb2uart.in_valid);
 		wait(uut.mprj.mprj.usb2uart.in_valid == 1);
 	end
 	endtask

 	initial begin
 		// Exercise Rx
 		j=0;
 		for (i=0; i<8; i=i+1)
 		begin
 			UART_WRITE_RX_AND_RCV(i);
 			k = uut.mprj.mprj.usb2uart.in_data;
 			if (k == i)
 				j=j+1;
 			else
 				$display("RX Test Failed - Incorrect Byte Received 0x%x", k);
 		end
 		if (j == 8)
 			$display("RX Test Passed - Correct Bytes Received");

 		$finish;
 	end

     // Reset Operation
     initial begin
         CSB <= 1'b1;
         RSTB <= 1'b0;
         #2000;
         RSTB <= 1'b1;       	// Release reset
         #1_300_000;
         CSB <= 1'b0;		// Stop driving CSB
     end

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

     wire flash_csb;
     wire flash_clk;
     wire flash_io0;
     wire flash_io1;

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

     caravel uut (
         .vddio	  (VDD3V3),
 		.vddio_2  (VDD3V3),
 		.vssio	  (VSS),
 		.vssio_2  (VSS),
 		.vdda	  (VDD3V3),
 		.vssa	  (VSS),
 		.vccd	  (VDD1V8),
 		.vssd	  (VSS),
 		.vdda1    (VDD3V3),
 		.vdda1_2  (VDD3V3),
 		.vdda2    (VDD3V3),
 		.vssa1	  (VSS),
 		.vssa1_2  (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("usb2uart.hex")
     ) spiflash (
         .csb(flash_csb),
         .clk(flash_clk),
         .io0(flash_io0),
         .io1(flash_io1),
         .io2(),         // not used
         .io3()          // not used
     );
 /*
 	// Testbench UART
 	tbuart tbuart (
 		.ser_rx(mgmt_uart_tx)
 	);
 */
 endmodule
 `default_nettype wire
	// SPDX-FileCopyrightText: 2020 Efabless Corporation
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.
	// SPDX-License-Identifier: Apache-2.0

	`default_nettype wire

	`timescale 1 ns / 1 ps

	module usb2uart_tb;

	// Testbench uses a 48 MHz clock
	// Want to interface to 115200 baud UART
	parameter c_CLOCK_MHZ = 48;
	parameter c_UART_SPEED = 115200;

	parameter c_CLOCK_PERIOD_NS = 1000/c_CLOCK_MHZ;
	parameter c_CLKS_PER_BIT = c_CLOCK_MHZ*1000000/c_UART_SPEED;
	parameter c_BIT_PERIOD = c_CLKS_PER_BIT*c_CLOCK_PERIOD_NS;

	integer i;
	integer j;
	integer k;

	// Signals declaration
	reg clock;
	reg RSTB;
	reg power1, power2;
	reg CSB;
	wire gpio;
	wire [37:0] mprj_io;

	reg user_uart_rx;
	/*
	wire mgmt_uart_tx;
	assign mgmt_uart_tx = mprj_io[6];
	*/
	// Signals Assignment
	assign mprj_io[34] = user_uart_rx;

	always #(c_CLOCK_PERIOD_NS/2) clock <= (clock === 1'b0);

	initial begin
	clock = 0;
	end

	`ifdef ENABLE_SDF
	initial begin
	$sdf_annotate("../../../sdf/user_proj_example.sdf", uut.mprj.mprj) ;
	$sdf_annotate("../../../mgmt_core_wrapper/sdf/DFFRAM.sdf", uut.soc.DFFRAM_0) ;
	$sdf_annotate("../../../mgmt_core_wrapper/sdf/mgmt_core.sdf", uut.soc.core) ;
	$sdf_annotate("../../../caravel/sdf/housekeeping.sdf", uut.housekeeping) ;
	$sdf_annotate("../../../caravel/sdf/chip_io.sdf", uut.padframe) ;
	$sdf_annotate("../../../caravel/sdf/mprj_logic_high.sdf", uut.mgmt_buffers.mprj_logic_high_inst) ;
	$sdf_annotate("../../../caravel/sdf/mprj2_logic_high.sdf", uut.mgmt_buffers.mprj2_logic_high_inst) ;
	$sdf_annotate("../../../caravel/sdf/mgmt_protect_hv.sdf", uut.mgmt_buffers.powergood_check) ;
	$sdf_annotate("../../../caravel/sdf/mgmt_protect.sdf", uut.mgmt_buffers) ;
	$sdf_annotate("../../../caravel/sdf/caravel_clocking.sdf", uut.clocking) ;
	$sdf_annotate("../../../caravel/sdf/digital_pll.sdf", uut.pll) ;
	$sdf_annotate("../../../caravel/sdf/xres_buf.sdf", uut.rstb_level) ;
	$sdf_annotate("../../../caravel/sdf/user_id_programming.sdf", uut.user_id_value) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_1[0] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_1[1] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_2[0] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_2[1] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_bidir_2[2] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[0] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[1] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[2] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[3] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[4] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[5] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[6] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[7] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[8] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[9] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1[10] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[0] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[1] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[2] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[3] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[4] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_1a[5] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[0] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[1] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[2] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[3] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[4] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[5] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[6] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[7] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[8] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[9] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[10] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[11] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[12] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[13] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[14] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_control_block.sdf", uut.\gpio_control_in_2[15] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_0[0] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_0[1] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_2[0] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_2[1] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.\gpio_defaults_block_2[2] ) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_5) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_6) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_7) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_8) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_9) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_10) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_11) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_12) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_13) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_14) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_15) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_16) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_17) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_18) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_19) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_20) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_21) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_22) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_23) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_24) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_25) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_26) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_27) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_28) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_29) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_30) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_31) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_32) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_33) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_34) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_35) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_36) ;
	$sdf_annotate("../../../caravel/sdf/gpio_defaults_block.sdf", uut.gpio_defaults_block_37) ;
	end
	`endif

	initial begin
	$dumpfile("usb2uart.vcd");
	$dumpvars(0, usb2uart_tb);
	//$monitor("usb2uart.in_data: 0x%x", uut.mprj.mprj.usb2uart.in_data);

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

	// Write a byte to RX pin
	task UART_WRITE_RX_AND_RCV;
	input [7:0] i_Data;
	integer ii;
	begin
	wait(uut.mprj.mprj.usb2uart.in_ready == 1);

	// Write Start Bit
	#(c_BIT_PERIOD) user_uart_rx <= 1'b0;

	// Write Data
	for (ii=0; ii<8; ii=ii+1)
	begin
	#(c_BIT_PERIOD) user_uart_rx <= i_Data[ii];
	end

	// Write Stop Bit
	#(c_BIT_PERIOD) user_uart_rx <= 1'b1;

	//@(posedge uut.mprj.mprj.usb2uart.in_valid);
	wait(uut.mprj.mprj.usb2uart.in_valid == 1);
	end
	endtask

	initial begin
	// Exercise Rx
	j=0;
	for (i=0; i<8; i=i+1)
	begin
	UART_WRITE_RX_AND_RCV(i);
	k = uut.mprj.mprj.usb2uart.in_data;
	if (k == i)
	j=j+1;
	else
	$display("RX Test Failed - Incorrect Byte Received 0x%x", k);
	end
	if (j == 8)
	$display("RX Test Passed - Correct Bytes Received");

	$finish;
	end

	// Reset Operation
	initial begin
	CSB <= 1'b1;
	RSTB <= 1'b0;
	#2000;
	RSTB <= 1'b1; // Release reset
	#1_300_000;
	CSB <= 1'b0; // Stop driving CSB
	end

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

	wire flash_csb;
	wire flash_clk;
	wire flash_io0;
	wire flash_io1;

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

	caravel uut (
	.vddio (VDD3V3),
	.vddio_2 (VDD3V3),
	.vssio (VSS),
	.vssio_2 (VSS),
	.vdda (VDD3V3),
	.vssa (VSS),
	.vccd (VDD1V8),
	.vssd (VSS),
	.vdda1 (VDD3V3),
	.vdda1_2 (VDD3V3),
	.vdda2 (VDD3V3),
	.vssa1 (VSS),
	.vssa1_2 (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("usb2uart.hex")
	) spiflash (
	.csb(flash_csb),
	.clk(flash_clk),
	.io0(flash_io0),
	.io1(flash_io1),
	.io2(), // not used
	.io3() // not used
	);
	/*
	// Testbench UART
	tbuart tbuart (
	.ser_rx(mgmt_uart_tx)
	);
	*/
	endmodule
	`default_nettype wire