verilog/rtl/rng_chaos_top.v

// 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
/*
 *-------------------------------------------------------------
 *
 * user_proj_example
 *
 * This is an example of a (trivially simple) user project,
 * showing how the user project can connect to the logic
 * analyzer, the wishbone bus, and the I/O pads.
 *
 * This project generates an integer count, which is output
 * on the user area GPIO pads (digital output only).  The
 * wishbone connection allows the project to be controlled
 * (start and stop) from the management SoC program.
 *
 * See the testbenches in directory "mprj_counter" for the
 * example programs that drive this user project.  The three
 * testbenches are "io_ports", "la_test1", and "la_test2".
 *
 *-------------------------------------------------------------
 */

module rng_chaos_top #(
    parameter BITS = 32
)(
`ifdef USE_POWER_PINS
    inout vccd1,	// User area 1 1.8V supply
    inout vssd1,	// User area 1 digital ground
`endif

    // Wishbone Slave ports (WB MI A)
    input wb_clk_i,
    input wb_rst_i,
    input wbs_stb_i,
    input wbs_cyc_i,
    input wbs_we_i,
    input [3:0] wbs_sel_i,
    input [31:0] wbs_dat_i,
    input [31:0] wbs_adr_i,
    output wbs_ack_o,
    output [31:0] wbs_dat_o,

    // Logic Analyzer Signals
    input  [127:0] la_data_in,
    output [127:0] la_data_out,
    input  [127:0] la_oenb,

    // IOs
    input  [`MPRJ_IO_PADS-1:0] io_in,
    output [`MPRJ_IO_PADS-1:0] io_out,
    output [`MPRJ_IO_PADS-1:0] io_oeb,

    // IRQ
    output [2:0] irq
);
    wire clk;
    wire rst;

	wire [31:0] x;
	wire [31:0] y;
	wire [31:0] z;

    // WB MI A
    assign wbs_ack_o = 1'b0;   // Unuset
    assign wbs_dat_o = 32'h0;  // Unuset

    // IO
    assign io_out = x;
    assign io_oeb = {(`MPRJ_IO_PADS-1){1'b1}};

    // IRQ
    assign irq = 3'b000;	// Unused

    // LA
	assign la_data_out = {{(32){1'b0}}, z, y, x};
    // Assuming LA probes [65:64] are for controlling the count clk & reset  
    assign clk = (~la_oenb[96]) ? la_data_in[96]: wb_clk_i;
    assign rst = (~la_oenb[97]) ? la_data_in[97]: wb_rst_i;


    rng_chaos u_rng_chaos(
        .clk_i(clk),
        .rst_ni(rst),
        .x(x),
        .y(y),
        .z(z)
    );

endmodule