// ***************************************************************************
// ***************************************************************************
// Copyright 2011(c) Analog Devices, Inc.
//
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// ***************************************************************************
// ***************************************************************************
// serial data output interface: serdes(x8)

`timescale 1ps/1ps

module ad_serdes_clk (

  // clock and divided clock

  input           rst,
  input           clk_in_p,
  input           clk_in_n,

  output          clk,
  output          div_clk,
  output          out_clk,
  output          loaden,
  output  [ 7:0]  phase,

  // drp interface

  input           up_clk,
  input           up_rstn,
  input           up_drp_sel,
  input           up_drp_wr,
  input   [11:0]  up_drp_addr,
  input   [31:0]  up_drp_wdata,
  output  [31:0]  up_drp_rdata,
  output          up_drp_ready,
  output          up_drp_locked);

  // internal registers

  reg             up_drp_sel_int = 'd0;
  reg             up_drp_rd_int = 'd0;
  reg             up_drp_wr_int = 'd0;
  reg     [ 8:0]  up_drp_addr_int = 'd0;
  reg     [31:0]  up_drp_wdata_int = 'd0;
  reg     [31:0]  up_drp_rdata_int = 'd0;
  reg             up_drp_ready_int = 'd0;
  reg             up_drp_locked_int_m = 'd0;
  reg             up_drp_locked_int = 'd0;

  // internal signals
  wire            up_drp_reset;
  wire    [31:0]  up_drp_rdata_int_s;
  wire            up_drp_busy_int_s;
  wire            up_drp_locked_int_s;

  // defaults

  assign up_drp_reset = ~up_rstn;
  assign out_clk = div_clk;
  assign up_drp_rdata = up_drp_rdata_int;
  assign up_drp_ready = up_drp_ready_int;
  assign up_drp_locked = up_drp_locked_int;

  always @(negedge up_rstn or posedge up_clk) begin
    if (up_rstn == 1'b0) begin
      up_drp_sel_int <= 1'b0;
      up_drp_rd_int <= 1'b0;
      up_drp_wr_int <= 1'b0;
      up_drp_addr_int <= 9'd0;
      up_drp_wdata_int <= 32'd0;
      up_drp_rdata_int <= 32'd0;
      up_drp_ready_int <= 1'b0;
      up_drp_locked_int_m <= 1'd0;
      up_drp_locked_int <= 1'd0;
    end else begin
      if (up_drp_sel_int == 1'b1) begin
        if (up_drp_busy_int_s == 1'b0) begin
          up_drp_sel_int <= 1'b0;
          up_drp_rd_int <= 1'b0;
          up_drp_wr_int <= 1'b0;
          up_drp_addr_int <= 9'd0;
          up_drp_wdata_int <= 32'd0;
          up_drp_rdata_int <= up_drp_rdata_int_s;
          up_drp_ready_int <= 1'b1;
        end
      end else if (up_drp_sel == 1'b1) begin
        up_drp_sel_int <= 1'b1;
        up_drp_rd_int <= ~up_drp_wr;
        up_drp_wr_int <= up_drp_wr;
        up_drp_addr_int <= up_drp_addr[8:0];
        up_drp_wdata_int <= up_drp_wdata;
        up_drp_rdata_int <= 32'd0;
        up_drp_ready_int <= 1'b0;
      end else begin
        up_drp_sel_int <= 1'b0;
        up_drp_rd_int <= 1'b0;
        up_drp_wr_int <= 1'b0;
        up_drp_addr_int <= 9'd0;
        up_drp_wdata_int <= 32'd0;
        up_drp_rdata_int <= 32'd0;
        up_drp_ready_int <= 1'b0;
      end
      up_drp_locked_int_m <= up_drp_locked_int_s;
      up_drp_locked_int <= up_drp_locked_int_m;
    end
  end

  // instantiations (ip- hw.tcl must generate this core)

  alt_serdes_clk_core i_core (
    .rst_reset (rst),
    .ref_clk_clk (clk_in_p),
    .locked_export (up_drp_locked_int_s),
    .hs_phase_phout (phase),
    .hs_clk_lvds_clk (clk),
    .loaden_loaden (loaden),
    .ls_clk_clk (div_clk),
    .drp_clk_clk (up_clk),
    .drp_rst_reset (up_drp_reset),
    .pll_reconfig_waitrequest (up_drp_busy_int_s),
    .pll_reconfig_read (up_drp_rd_int),
    .pll_reconfig_write (up_drp_wr_int),
    .pll_reconfig_readdata (up_drp_rdata_int_s),
    .pll_reconfig_address (up_drp_addr_int),
    .pll_reconfig_writedata (up_drp_wdata_int));
  
endmodule

// ***************************************************************************
// ***************************************************************************