| // 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 |
| |
| `ifdef GL |
| `include "gl/user_project/gl/user_proj_top.v" |
| `include "gl/user_project/gl/user_project_wrapper.v" |
| `else |
| `define USE_POWER_PINS |
| `include "gl/user_project/gl/user_proj_top.v" |
| `include "user_project_wrapper.v" |
| `endif |
| |
| `include "caravel.v" |
| `include "spiflash.v" |
| |
| `define SOC_SETUP_TIME 170_000 |
| |
| module chain_tb; |
| reg clock; |
| reg RSTB; |
| reg CSB; |
| reg power1, power2; |
| reg power3, power4; |
| |
| wire gpio; |
| wire [37:0] mprj_io; |
| |
| // JTAG Ports |
| reg tms; |
| reg tck; |
| reg tdi; |
| reg trst; |
| |
| wire tdo; |
| |
| assign mprj_io[0] = tck; |
| assign mprj_io[1] = tms; |
| assign mprj_io[2] = tdi; |
| assign mprj_io[3] = (CSB == 1'b1) ? 1'b1 : 1'bz; |
| assign mprj_io[5] = trst; |
| assign tdo = mprj_io[4]; |
| |
| // 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 clock <= (clock === 1'b0); |
| always #10 tck <= (tck === 1'b0); |
| |
| wire[470:0] serializable = |
| 471'b000000010101111101000011111101110100110110111111101111010100010101010011010101110111000110011110110100001110100011001110001010000001110110111011000101110101101001101111000110110000110011011010000100010000011000011111111000000100011000110111001001010100101001110000110111001000000010111100011100101100000111100100011100001001101000011010000000001011011001010101011011010011010100110111111011001010101000110011111011110011000111110111000110011001001001010010100101101000001; |
| reg[470:0] serial; |
| |
| wire[7:0] tmsPattern = 8'b 01100110; |
| wire[3:0] preload_chain = 4'b0011; |
| |
| initial begin |
| clock = 0; |
| end |
| |
| initial begin |
| $dumpfile("chain.vcd"); |
| $dumpvars(0, chain_tb); |
| |
| // Repeat cycles of 1000 clock edges as needed to complete testbench |
| repeat (60) begin |
| repeat (1000) @(posedge clock); |
| // $display("+1000 cycles"); |
| end |
| $display("%c[1;31m",27); |
| $display ("Monitor: Timeout, Test Chain (RTL) Failed"); |
| $display("%c[0m",27); |
| $finish; |
| end |
| |
| integer i; |
| |
| initial begin |
| tms = 0 ; |
| tck = 0 ; |
| tdi = 0 ; |
| trst = 0 ; |
| RSTB <= 1'b0; |
| CSB <= 1'b1; |
| tms = 1; |
| #2000; |
| RSTB <= 1'b1; // Release reset |
| #(`SOC_SETUP_TIME); |
| CSB = 1'b0; // CSB can be released |
| #20; |
| trst = 1; |
| #20; |
| |
| /* |
| Test PreloadChain Instruction |
| */ |
| shiftIR(preload_chain); |
| enterShiftDR(); |
| |
| for (i = 0; i < 471; i = i + 1) begin |
| tdi = serializable[i]; |
| #20; |
| end |
| for(i = 0; i< 471; i = i + 1) begin |
| serial[i] = tdo; |
| #20; |
| end |
| |
| if(serial !== serializable) begin |
| $error("EXECUTING_PRELOAD_CHAIN_INST_FAILED"); |
| $finish; |
| end |
| exitDR(); |
| |
| $display("SUCCESS_STRING"); |
| $finish; |
| end |
| |
| task shiftIR; |
| input[3:0] instruction; |
| integer i; |
| begin |
| for (i = 0; i< 5; i = i + 1) begin |
| tms = tmsPattern[i]; |
| #20; |
| end |
| |
| // At shift-IR: shift new instruction on tdi line |
| for (i = 0; i < 4; i = i + 1) begin |
| tdi = instruction[i]; |
| if(i == 3) begin |
| tms = tmsPattern[5]; // exit-ir |
| end |
| #20; |
| end |
| |
| tms = tmsPattern[6]; // update-ir |
| #20; |
| tms = tmsPattern[7]; // run test-idle |
| #60; |
| end |
| endtask |
| |
| task enterShiftDR; |
| begin |
| tms = 1; // select DR |
| #20; |
| tms = 0; // capture DR -- shift DR |
| #40; |
| end |
| endtask |
| |
| task exitDR; |
| begin |
| tms = 1; // Exit DR -- update DR |
| #40; |
| tms = 0; // Run test-idle |
| #20; |
| end |
| endtask |
| |
| 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 |
| |
| wire flash_csb; |
| wire flash_clk; |
| wire flash_io0; |
| wire flash_io1; |
| |
| wire VDD3V3 = power1; |
| wire VDD1V8 = power2; |
| wire USER_VDD3V3 = power3; |
| wire USER_VDD1V8 = power4; |
| wire VSS = 1'b0; |
| |
| caravel uut ( |
| .vddio (VDD3V3), |
| .vssio (VSS), |
| .vdda (VDD3V3), |
| .vssa (VSS), |
| .vccd (VDD1V8), |
| .vssd (VSS), |
| .vdda1 (USER_VDD3V3), |
| .vdda2 (USER_VDD3V3), |
| .vssa1 (VSS), |
| .vssa2 (VSS), |
| .vccd1 (USER_VDD1V8), |
| .vccd2 (USER_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("chain.hex") |
| ) spiflash ( |
| .csb(flash_csb), |
| .clk(flash_clk), |
| .io0(flash_io0), |
| .io1(flash_io1), |
| .io2(), // not used |
| .io3() // not used |
| ); |
| |
| endmodule |
| `default_nettype wire |