blob: f46fee95787098c833860349f876414102350fbc [file] [log] [blame]
`default_nettype none
/*
* 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 "caravel.v"
`include "spiflash.v"
module gpio_tb;
reg clock;
reg power1;
reg power2;
always #10 clock <= (clock === 1'b0);
initial begin
clock <= 0;
end
initial begin
$dumpfile("gpio.vcd");
$dumpvars(0, gpio_tb);
// Repeat cycles of 1000 clock edges as needed to complete testbench
repeat (25) begin
repeat (1000) @(posedge clock);
$display("+1000 cycles");
end
$display("%c[1;31m",27);
`ifdef GL
$display ("Monitor: Timeout, Test GPIO (GL) Failed");
`else
$display ("Monitor: Timeout, Test GPIO (RTL) Failed");
`endif
$display("%c[0m",27);
$finish;
end
wire [37:0] mprj_io; // Most of these are no-connects
wire [15:0] checkbits;
reg [7:0] checkbits_lo;
wire [7:0] checkbits_hi;
assign mprj_io[23:16] = checkbits_lo;
assign checkbits = mprj_io[31:16];
assign checkbits_hi = checkbits[15:8];
assign mprj_io[3] = 1'b1; // Force CSB high.
wire flash_csb;
wire flash_clk;
wire flash_io0;
wire flash_io1;
wire gpio;
reg RSTB;
// Transactor
initial begin
checkbits_lo <= {8{1'bz}};
wait(checkbits_hi == 8'hA0);
checkbits_lo <= 8'hF0;
wait(checkbits_hi == 8'h0B);
checkbits_lo <= 8'h0F;
wait(checkbits_hi == 8'hAB);
checkbits_lo <= 8'h0;
repeat (1000) @(posedge clock);
checkbits_lo <= 8'h1;
repeat (1000) @(posedge clock);
checkbits_lo <= 8'h3;
end
// Monitor
initial begin
wait(checkbits_hi == 8'hA0);
wait(checkbits[7:0] == 8'hF0);
wait(checkbits_hi == 8'h0B);
wait(checkbits[7:0] == 8'h0F);
wait(checkbits_hi == 8'hAB);
wait(checkbits[7:0] == 8'h00);
wait(checkbits_hi == 8'h01);
wait(checkbits[7:0] == 8'h01);
wait(checkbits_hi == 8'h02);
wait(checkbits[7:0] == 8'h03);
wait(checkbits_hi == 8'h04);
`ifdef GL
$display("Monitor: Test GPIO (GL) Passed");
`else
$display("Monitor: Test GPIO (RTL) Passed");
`endif
$finish;
end
initial begin
RSTB <= 1'b0;
#1000;
RSTB <= 1'b1; // Release reset
#2000;
end
initial begin // Power-up
power1 <= 1'b0;
power2 <= 1'b0;
#200;
power1 <= 1'b1;
#200;
power2 <= 1'b1;
end
always @(checkbits) begin
#1 $display("GPIO state = %b (%d - %d)", checkbits,
checkbits_hi, checkbits_lo);
end
wire VDD3V3;
wire VDD1V8;
wire VSS;
assign VDD3V3 = power1;
assign VDD1V8 = power2;
assign VSS = 1'b0;
// These are the mappings of mprj_io GPIO pads that are set to
// specific functions on startup:
//
// JTAG = mgmt_gpio_io[0] (inout)
// SDO = mgmt_gpio_io[1] (output)
// SDI = mgmt_gpio_io[2] (input)
// CSB = mgmt_gpio_io[3] (input)
// SCK = mgmt_gpio_io[4] (input)
// ser_rx = mgmt_gpio_io[5] (input)
// ser_tx = mgmt_gpio_io[6] (output)
// irq = mgmt_gpio_io[7] (input)
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("gpio.hex")
) spiflash (
.csb(flash_csb),
.clk(flash_clk),
.io0(flash_io0),
.io1(flash_io1),
.io2(), // not used
.io3() // not used
);
endmodule
`default_nettype wire