`timescale 1 ns/1 ps
// =============================================================================
// cdc_req_resp
//   Bidirectional channel made from two cdc_strobe_data mailboxes.
// =============================================================================
module cdc_req_resp #(
  parameter integer REQ_W          = 32,
  parameter integer RESP_W         = 32,
  parameter integer STABLE_SAMPLES = 2
)(
  // Side A (e.g., JTAG/TCK)
  input  wire               a_clk,
  input  wire               a_rst,

  input  wire               a_req_pulse,
  input  wire [REQ_W-1:0]   a_req_data,
  output wire               a_req_busy,
  output wire               a_req_accepted,

  output wire               a_resp_pulse,
  output wire [RESP_W-1:0]  a_resp_data,

  // Side B (e.g., system/i_clk)
  input  wire               b_clk,
  input  wire               b_rst,

  output wire               b_req_pulse,
  output wire [REQ_W-1:0]   b_req_data,

  input  wire               b_resp_pulse,
  input  wire [RESP_W-1:0]  b_resp_data,
  output wire               b_resp_busy,
  output wire               b_resp_accepted
);

  cdc_strobe_data #(
    .WIDTH(REQ_W),
    .STABLE_SAMPLES(STABLE_SAMPLES)
  ) u_req (
    .s_clk(a_clk),
    .s_rst(a_rst),
    .s_pulse(a_req_pulse),
    .s_data(a_req_data),
    .s_busy(a_req_busy),
    .s_accepted(a_req_accepted),

    .d_clk(b_clk),
    .d_rst(b_rst),
    .d_pulse(b_req_pulse),
    .d_data(b_req_data)
  );

  cdc_strobe_data #(
    .WIDTH(RESP_W),
    .STABLE_SAMPLES(STABLE_SAMPLES)
  ) u_resp (
    .s_clk(b_clk),
    .s_rst(b_rst),
    .s_pulse(b_resp_pulse),
    .s_data(b_resp_data),
    .s_busy(b_resp_busy),
    .s_accepted(b_resp_accepted),

    .d_clk(a_clk),
    .d_rst(a_rst),
    .d_pulse(a_resp_pulse),
    .d_data(a_resp_data)
  );

endmodule