jellyfish-powersupply/gw/test/qspi_decoder_tb_4c4a8d.sv

`timescale 1ns / 1ps

// SPDX-FileCopyrightText: 2025 Igor Brkic <igor@hyperglitch.com>
// SPDX-License-Identifier: GPL-3.0-or-later

// 4 command lines
// 4 address lines
// 2 dummy cycles
// 8 data lines
module qspi_decoder_tb;

  localparam ADDRESS_WIDTH = 24;
  localparam ADDRESS_LINES = 4;
  localparam COMMAND_WIDTH = 8;
  localparam COMMAND_LINES = 4;
  localparam DUMMY_CYCLES = 2;
  localparam DATA_WIDTH = 8;
  localparam DATA_LINES = 4;
  localparam DATA_BANKS = 2;

  reg i_rst;
  reg i_ncs;
  reg i_clk;
  reg i_bk1_io0;
  reg i_bk1_io1;
  reg i_bk1_io2;
  reg i_bk1_io3;
  reg i_bk2_io0;
  reg i_bk2_io1;
  reg i_bk2_io2;
  reg i_bk2_io3;
  reg rdy;
  reg [COMMAND_WIDTH-1:0] o_command;
  wire [DATA_WIDTH*DATA_BANKS-1:0] o_data;

  qspi_decoder #(
    .ADDRESS_WIDTH(ADDRESS_WIDTH),
    .ADDRESS_LINES(ADDRESS_LINES),
    .COMMAND_WIDTH(COMMAND_WIDTH),
    .COMMAND_LINES(COMMAND_LINES),
    .DUMMY_CYCLES(DUMMY_CYCLES),
    .DATA_WIDTH(DATA_WIDTH),
    .DATA_LINES(DATA_LINES),
    .DATA_BANKS(DATA_BANKS)
  ) dut (
    .i_rst(i_rst),
    .i_ncs(i_ncs),
    .i_clk(i_clk),
    .i_bk1_io0(i_bk1_io0),
    .i_bk1_io1(i_bk1_io1),
    .i_bk1_io2(i_bk1_io2),
    .i_bk1_io3(i_bk1_io3),
    .i_bk2_io0(i_bk2_io0),
    .i_bk2_io1(i_bk2_io1),
    .i_bk2_io2(i_bk2_io2),
    .i_bk2_io3(i_bk2_io3),
    .rdy(rdy),
    .o_command(o_command),
    .o_data(o_data)
  );

  // generate clock
  initial begin
    i_clk = 0;
    #25;
    forever #5 i_clk = ~i_clk; // 100MHz
  end

  // test sequence
  initial begin
    i_ncs = 1;
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;
    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;

    // reset
    i_rst = 1;
    #10;
    i_rst = 0;
    #10;

    // chip select
    i_ncs = 0;
    #5

    // send command over all four lines
    i_bk1_io0 = 0;
    i_bk1_io1 = 1;
    i_bk1_io2 = 0;
    i_bk1_io3 = 1;

    i_bk2_io0 = 0;
    i_bk2_io1 = 1;
    i_bk2_io2 = 0;
    i_bk2_io3 = 1;

    #10;

    i_bk1_io0 = 1;
    i_bk1_io1 = 0;
    i_bk1_io2 = 1;
    i_bk1_io3 = 1;

    i_bk2_io0 = 1;
    i_bk2_io1 = 0;
    i_bk2_io2 = 1;
    i_bk2_io3 = 1;

    #10;

    assert(dut.command == 8'hAD);

    // send address over all four lines
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;

    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;

    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    i_bk1_io0 = 1;
    i_bk1_io1 = 0;
    i_bk1_io2 = 1;
    i_bk1_io3 = 0;

    i_bk2_io0 = 1;
    i_bk2_io1 = 0;
    i_bk2_io2 = 1;
    i_bk2_io3 = 0;
    #10;

    i_bk1_io0 = 0;
    i_bk1_io1 = 1;
    i_bk1_io2 = 1;
    i_bk1_io3 = 0;

    i_bk2_io0 = 0;
    i_bk2_io1 = 1;
    i_bk2_io2 = 1;
    i_bk2_io3 = 0;
    #10;

    i_bk1_io0 = 0;
    i_bk1_io1 = 1;
    i_bk1_io2 = 0;
    i_bk1_io3 = 1;

    i_bk2_io0 = 0;
    i_bk2_io1 = 1;
    i_bk2_io2 = 0;
    i_bk2_io3 = 1;
    #10;

    i_bk1_io0 = 0;
    i_bk1_io1 = 1;
    i_bk1_io2 = 0;
    i_bk1_io3 = 1;

    i_bk2_io0 = 0;
    i_bk2_io1 = 1;
    i_bk2_io2 = 0;
    i_bk2_io3 = 1;
    #10;
    
    assert(dut.address == 24'h0056AA);

    // dummy cycles
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;

    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;
    #10;

    // send data over 8 lines

    // byte 0
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 1;
    i_bk1_io3 = 1;
    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    // byte 1
    i_bk1_io0 = 1;
    i_bk1_io1 = 1;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;
    i_bk2_io0 = 1;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    // byte 2
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;
    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    // byte 3
    i_bk1_io0 = 0;
    i_bk1_io1 = 1;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;
    i_bk2_io0 = 1;
    i_bk2_io1 = 1;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    // byte 4
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;
    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    // byte 5
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 1;
    i_bk1_io3 = 0;
    i_bk2_io0 = 1;
    i_bk2_io1 = 0;
    i_bk2_io2 = 1;
    i_bk2_io3 = 0;
    #10;

    // byte 6
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;
    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    // byte 7
    i_bk1_io0 = 0;
    i_bk1_io1 = 1;
    i_bk1_io2 = 1;
    i_bk1_io3 = 0;
    i_bk2_io0 = 1;
    i_bk2_io1 = 1;
    i_bk2_io2 = 1;
    i_bk2_io3 = 0;
    #10;

    // byte 8
    i_bk1_io0 = 0;
    i_bk1_io1 = 1;
    i_bk1_io2 = 0;
    i_bk1_io3 = 1;
    i_bk2_io0 = 1;
    i_bk2_io1 = 1;
    i_bk2_io2 = 0;
    i_bk2_io3 = 1;
    #10;

    // byte 9
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 1;
    i_bk2_io0 = 1;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 1;
    #10;

    // byte 10
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 1;
    i_bk1_io3 = 1;
    i_bk2_io0 = 1;
    i_bk2_io1 = 0;
    i_bk2_io2 = 1;
    i_bk2_io3 = 1;
    #10;

    // byte 11
    i_bk1_io0 = 0;
    i_bk1_io1 = 1;
    i_bk1_io2 = 0;
    i_bk1_io3 = 1;
    i_bk2_io0 = 1;
    i_bk2_io1 = 1;
    i_bk2_io2 = 0;
    i_bk2_io3 = 1;
    #10;

    // byte 12
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;
    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    // byte 13
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 1;
    i_bk1_io3 = 1;
    i_bk2_io0 = 1;
    i_bk2_io1 = 0;
    i_bk2_io2 = 1;
    i_bk2_io3 = 1;
    #10;

    // byte 14
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;
    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #10;

    // byte 15
    i_bk1_io0 = 0;
    i_bk1_io1 = 1;
    i_bk1_io2 = 1;
    i_bk1_io3 = 1;
    i_bk2_io0 = 1;
    i_bk2_io1 = 1;
    i_bk2_io2 = 1;
    i_bk2_io3 = 1;
    #10;

    i_ncs = 1;
    i_bk1_io0 = 0;
    i_bk1_io1 = 0;
    i_bk1_io2 = 0;
    i_bk1_io3 = 0;
    i_bk2_io0 = 0;
    i_bk2_io1 = 0;
    i_bk2_io2 = 0;
    i_bk2_io3 = 0;
    #20;


    $finish;
  end

  initial begin
    $dumpfile("build/qspi_decoder_tb.vcd");
    $dumpvars(0, qspi_decoder_tb);
  end

endmodule