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// 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 none
`timescale 1 ns / 1 ps
module peripheral_tb;
reg clock;
reg RSTB;
reg CSB;
reg power1, power2;
reg power3, power4;
wire gpio;
wire [37:0] mprj_io;
wire blink = mprj_io[32];
wire[3:0] gpioTestData = mprj_io[15:12];
assign mprj_io[3] = (CSB == 1'b1) ? 1'b1 : 1'bz;
// assign mprj_io[3] = 1'b1;
// 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 #12.5 clock <= (clock === 1'b0);
initial begin
clock = 0;
end
initial begin
$dumpfile("peripheral.vcd");
$dumpvars(0, peripheral_tb);
// Repeat cycles of 1000 clock edges as needed to complete testbench
repeat (100) begin
repeat (1000) @(posedge clock);
//$display("+1000 cycles");
end
$display("%c[1;31m",27);
`ifdef GL
$display ("Monitor: Timeout, Peripheral Test (GL) Failed");
`else
$display ("Monitor: Timeout, Peripheral Test (RTL) Failed");
`endif
$display("%c[0m",27);
$finish;
end
initial begin
// Observe Output pins
wait(gpioTestData == 4'b0000);
wait(gpioTestData == 4'b0001);
wait(gpioTestData == 4'b0011);
wait(gpioTestData == 4'b0111);
wait(gpioTestData == 4'b1111);
wait(gpioTestData == 4'b1110);
wait(gpioTestData == 4'b1100);
wait(gpioTestData == 4'b1000);
wait(gpioTestData == 4'b0000);
`ifdef GL
$display("Monitor: Test 1 GPIO (GL) Passed");
`else
$display("Monitor: Test 1 GPIO (RTL) Passed");
`endif
$finish;
end
initial begin
RSTB <= 1'b0;
CSB <= 1'b1; // Force CSB high
#2000;
RSTB <= 1'b1; // Release reset
#300000;
CSB = 1'b0; // CSB can be released
end
initial begin // Power-up sequence
power1 <= 1'b0;
power2 <= 1'b0;
power3 <= 1'b0;
power4 <= 1'b0;
#100;
power1 <= 1'b1;
#100;
power2 <= 1'b1;
#100;
power3 <= 1'b1;
#100;
power4 <= 1'b1;
end
always @(mprj_io) begin
//#1 $display("MPRJ-IO state = %b ", mprj_io);
#1 $display("GPIO Test = %b ", gpioTestData);
end
wire flash_csb;
wire flash_clk;
wire flash_io0;
wire flash_io1;
wire VDD3V3;
wire VDD1V8;
wire VSS;
assign VDD3V3 = power1;
assign VDD1V8 = power2;
assign 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("peripheral.hex")
) spiflash (
.csb(flash_csb),
.clk(flash_clk),
.io0(flash_io0),
.io1(flash_io1),
.io2(), // not used
.io3() // not used
);
tbuart tbuart (
.ser_rx(mprj_io[6])
);
endmodule
`default_nettype wire