| // 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 |
| |
| `include "uprj_netlists.v" |
| `include "caravel_netlists.v" |
| `include "spiflash.v" |
| `include "tbuart.v" |
| |
| /* |
| * This testbench expands upon test2 by doing a complete load of data |
| * to all cells in the array, and then testing that the cells are |
| * generating the correct function by applying input via the logic |
| * analyzer, and reading output from the GPIO (the C program reads |
| * output from the logic analyzer and copies it to the GPIO). |
| */ |
| |
| module chaos_test3_tb; |
| reg clock; |
| reg RSTB; |
| reg CSB; |
| |
| reg power1, power2; |
| |
| wire gpio; |
| wire uart_tx; |
| wire [37:0] mprj_io; |
| wire [15:0] checkbits; |
| wire [7:0] checklut; |
| |
| assign checkbits = mprj_io[31:16]; |
| assign uart_tx = mprj_io[6]; |
| assign checklut = mprj_io[15:8]; |
| |
| always #12.5 clock <= (clock === 1'b0); |
| |
| initial begin |
| clock = 0; |
| end |
| |
| assign mprj_io[3] = (CSB == 1'b1) ? 1'b1 : 1'bz; |
| |
| initial begin |
| $dumpfile("chaos_test3.vcd"); |
| // $dumpvars(0, chaos_test3_tb); |
| // Check the overall signals in the chaos automaton without |
| // saving tons of data from the 400 individual cells. |
| $dumpvars(1, chaos_test3_tb); |
| $dumpvars(1, chaos_test3_tb.uut.mprj.chaos); |
| $dumpvars(1, chaos_test3_tb.uut.mprj.chaos.chaos_array_inst); |
| |
| // Test break-out cell (see note in chaos_automaton.v) |
| // $dumpvars(1, chaos_test3_tb.uut.mprj.chaos.chaos_array_inst.chaos_cell_inst_0_0); |
| // And look at the LUT values in above cells. |
| // $dumpvars(0, chaos_test3_tb.uut.mprj.chaos.chaos_array_inst.chaos_cell_inst_0_0.lutdata[3]); |
| |
| // Check where in the program the CPU is operating |
| $dumpvars(1, chaos_test3_tb.uut.soc.soc.cpu.picorv32_core.dbg_insn_addr); |
| $dumpvars(1, chaos_test3_tb.uut.soc.soc.cpu.picorv32_core.dbg_insn_opcode); |
| $dumpvars(1, chaos_test3_tb.uut.soc.soc.cpu.picorv32_core.dbg_ascii_instr); |
| // Check GPIO serial load, which gates the 1st part of the simulation |
| $dumpvars(1, chaos_test3_tb.uut.mprj_io_loader_clock); |
| $dumpvars(1, chaos_test3_tb.uut.mprj_io_loader_resetn); |
| |
| // Repeat cycles of 1000 clock edges as needed to complete testbench |
| repeat (700) begin |
| repeat (1000) @(posedge clock); |
| // $display("+1000 cycles"); |
| end |
| $display("%c[1;31m",27); |
| `ifdef GL |
| $display ("Monitor: Timeout, Test (GL) Failed"); |
| `else |
| $display ("Monitor: Timeout, Test (RTL) Failed"); |
| `endif |
| $display("%c[0m",27); |
| $finish; |
| end |
| |
| initial begin |
| wait(checkbits == 16'hAB40); |
| $display("Chaos Test 3 started"); |
| wait(checkbits == 16'hAB41); |
| $display("Chaos Test 3 midpoint"); |
| wait(checkbits == 16'h0000); |
| $display("Chaos Test 3 saw LUT data = 0000"); |
| wait(checkbits == 16'hffff); |
| $display("Chaos Test 3 saw LUT data = FFFF"); |
| wait(checkbits == 16'hAB51); |
| #10000; |
| $finish; |
| end |
| |
| initial begin |
| RSTB <= 1'b0; |
| CSB <= 1'b1; // Force CSB high |
| #2000; |
| RSTB <= 1'b1; // Release reset |
| #170000; |
| CSB = 1'b0; // CSB can be released |
| end |
| |
| initial begin // Power-up sequence |
| power1 <= 1'b0; |
| power2 <= 1'b0; |
| #200; |
| power1 <= 1'b1; |
| #200; |
| power2 <= 1'b1; |
| end |
| |
| wire flash_csb; |
| wire flash_clk; |
| wire flash_io0; |
| wire flash_io1; |
| |
| wire VDD1V8; |
| wire VDD3V3; |
| wire VSS; |
| |
| assign VDD3V3 = power1; |
| assign VDD1V8 = power2; |
| assign VSS = 1'b0; |
| |
| 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("chaos_test3.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 |