| `default_nettype none |
| /* |
| * SPDX-FileCopyrightText: 2017 Clifford Wolf, 2018 Tim Edwards |
| * |
| * StriVe - A full example SoC using PicoRV32 in SkyWater s8 |
| * |
| * Copyright (C) 2017 Clifford Wolf <clifford@clifford.at> |
| * Copyright (C) 2018 Tim Edwards <tim@efabless.com> |
| * |
| * Permission to use, copy, modify, and/or distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| * |
| * SPDX-License-Identifier: ISC |
| */ |
| |
| `timescale 1 ns / 1 ps |
| |
| `include "caravel_netlists.v" |
| `include "spiflash.v" |
| `include "tbuart.v" |
| |
| module uart_tb; |
| reg clock; |
| reg RSTB; |
| reg power1, power2; |
| |
| wire gpio; |
| wire flash_csb; |
| wire flash_clk; |
| wire flash_io0; |
| wire flash_io1; |
| wire [37:0] mprj_io; |
| wire [15:0] checkbits; |
| wire uart_tx; |
| wire SDO; |
| |
| assign checkbits = mprj_io[31:16]; |
| assign uart_tx = mprj_io[6]; |
| |
| always #12.5 clock <= (clock === 1'b0); |
| |
| initial begin |
| clock = 0; |
| end |
| |
| initial begin |
| $dumpfile("uart.vcd"); |
| $dumpvars(0, uart_tb); |
| |
| $display("Wait for UART o/p"); |
| repeat (150) begin |
| repeat (10000) @(posedge clock); |
| // Diagnostic. . . interrupts output pattern. |
| end |
| $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'hA000) begin |
| $display("UART Test started"); |
| end |
| else if(checkbits == 16'hAB00) begin |
| `ifdef GL |
| $display("UART Test (GL) passed"); |
| `else |
| $display("UART Test (RTL) passed"); |
| `endif |
| $finish; |
| end |
| end |
| |
| wire VDD3V3; |
| wire VDD1V8; |
| wire VSS; |
| |
| assign VDD3V3 = power1; |
| assign VDD1V8 = power2; |
| assign VSS = 1'b0; |
| |
| 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("uart.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(uart_tx) |
| ); |
| |
| endmodule |
| `default_nettype wire |