| /* |
| * 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. |
| * |
| */ |
| |
| `timescale 1 ns / 1 ps |
| |
| `include "harness.v" |
| `include "spiflash.v" |
| |
| module gpio_tb; |
| reg XCLK; |
| |
| wire VDD3V3; |
| assign VDD3V3 = 1'b1; |
| |
| reg XI; |
| |
| reg real adc_h, adc_l; |
| reg real adc_0, adc_1; |
| reg real comp_n, comp_p; |
| |
| // 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 XCLK <= (XCLK === 1'b0); |
| always #220 XI <= (XI === 1'b0); |
| |
| initial begin |
| XI = 0; |
| XCLK = 0; |
| end |
| |
| initial begin |
| // Analog input pin values |
| adc_h = 0.0; |
| adc_l = 0.0; |
| adc_0 = 0.0; |
| adc_1 = 0.0; |
| comp_n = 0.0; |
| comp_p = 0.0; |
| #2000; |
| adc_h = 3.25; |
| adc_l = 0.05; |
| adc_0 = 1.0; |
| adc_1 = 1.5; |
| comp_n = 2.0; |
| comp_p = 2.5; |
| end |
| |
| initial begin |
| $dumpfile("gpio.vcd"); |
| $dumpvars(0, gpio_tb); |
| |
| // Repeat cycles of 1000 XCLK edges as needed to complete testbench |
| repeat (25) begin |
| repeat (1000) @(posedge XCLK); |
| $display("+1000 cycles"); |
| end |
| $display("%c[1;31m",27); |
| $display ("Monitor: Timeout, Test GPIO (RTL) Failed"); |
| $display("%c[0m",27); |
| $finish; |
| end |
| |
| wire [15:0] gpio; |
| |
| reg [7:0] gpio_lo; |
| wire [7:0] gpio_hi; |
| |
| assign gpio[7:0] = gpio_lo; |
| assign gpio_hi = gpio[15:8]; |
| |
| wire flash_csb; |
| wire flash_clk; |
| wire flash_io0; |
| wire flash_io1; |
| wire flash_io2; |
| wire flash_io3; |
| |
| reg SDI, CSB, SCK, RSTB; |
| wire SDO; |
| |
| // Transactor |
| initial begin |
| gpio_lo = {8{1'bz}}; |
| wait(gpio_hi==8'hA0); |
| gpio_lo = 8'hF0; |
| wait(gpio_hi==8'h0B); |
| gpio_lo = 8'h0F; |
| wait(gpio_hi==8'hAB); |
| gpio_lo = 8'h0; |
| repeat (1000) @(posedge XCLK); |
| gpio_lo = 8'h1; |
| repeat (1000) @(posedge XCLK); |
| gpio_lo = 8'h3; |
| end |
| |
| // Monitor |
| initial begin |
| wait(gpio_hi==8'hA0); |
| wait(gpio[7:0]==8'hF0); |
| wait(gpio_hi==8'h0B); |
| wait(gpio[7:0]==8'h0F); |
| wait(gpio_hi==8'hAB); |
| wait(gpio[7:0]==8'h00); |
| wait(gpio_hi==8'h01); |
| wait(gpio[7:0]==8'h01); |
| wait(gpio_hi==8'h02); |
| wait(gpio[7:0]==8'h03); |
| wait(gpio_hi==8'h04); |
| $display("Monitor: Test GPIO (RTL) Passed"); |
| $finish; |
| end |
| |
| initial begin |
| CSB <= 1'b1; |
| SCK <= 1'b0; |
| SDI <= 1'b0; |
| RSTB <= 1'b0; |
| |
| #1000; |
| RSTB <= 1'b1; // Release reset |
| #2000; |
| CSB <= 1'b0; // Apply CSB to start transmission |
| end |
| |
| always @(gpio) begin |
| #1 $display("GPIO state = %b (%d - %d)", gpio, gpio_hi, gpio_lo); |
| end |
| |
| wire VDD1V8; |
| wire VSS; |
| |
| assign VSS = 1'b0; |
| assign VDD1V8 = 1'b1; |
| |
| harness uut ( |
| .vdd (VDD3V3), |
| .vdd1v8 (VDD1V8), |
| .vss (VSS), |
| .xi (XI), |
| .xclk (XCLK), |
| .SDI (SDI), |
| .SDO (SDO), |
| .CSB (CSB), |
| .SCK (SCK), |
| .ser_rx (1'b0), |
| .ser_tx (), |
| .irq (1'b0), |
| .gpio (gpio), |
| .flash_csb(flash_csb), |
| .flash_clk(flash_clk), |
| .flash_io0(flash_io0), |
| .flash_io1(flash_io1), |
| .flash_io2(flash_io2), |
| .flash_io3(flash_io3), |
| .adc_high (adc_h), |
| .adc_low (adc_l), |
| .adc0_in (adc_0), |
| .adc1_in (adc_1), |
| .RSTB (RSTB), |
| .comp_inp (comp_p), |
| .comp_inn (comp_n) |
| ); |
| |
| spiflash #( |
| .FILENAME("gpio.hex") |
| ) spiflash ( |
| .csb(flash_csb), |
| .clk(flash_clk), |
| .io0(flash_io0), |
| .io1(flash_io1), |
| .io2(flash_io2), |
| .io3(flash_io3) |
| ); |
| |
| endmodule |