Subversion Repositories 1g_ethernet_dpi

//------------------------------------------------------------------------------
// Title      : CDC Sync Block
// Project    : Tri-Mode Ethernet MAC
//------------------------------------------------------------------------------
// File       : tri_mode_ethernet_mac_0_sync_block.v
// Author     : Xilinx Inc.
//------------------------------------------------------------------------------
// Description: Used on signals crossing from one clock domain to another, this
//              is a multiple flip-flop pipeline, with all flops placed together
//              into the same slice.  Thus the routing delay between the two is
//              minimum to safe-guard against metastability issues.
// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
 
`timescale 1ps / 1ps
 
(* dont_touch = "yes" *)
module tri_mode_ethernet_mac_0_sync_block #(
  parameter INITIALISE = 1'b0,
  parameter DEPTH = 5
)
(
  input        clk,              // clock to be sync'ed to
  input        data_in,          // Data to be 'synced'
  output       data_out          // synced data
);
 
  // Internal Signals
  wire   data_sync0;
  wire   data_sync1;
  wire   data_sync2;
  wire   data_sync3;
  wire   data_sync4;
 
 
  (* ASYNC_REG = "TRUE", SHREG_EXTRACT = "NO" *)
  FDRE #(
    .INIT (INITIALISE[0])
  ) data_sync_reg0 (
    .C  (clk),
    .D  (data_in),
    .Q  (data_sync0),
	.CE (1'b1),
    .R  (1'b0)
  );
 
  (* ASYNC_REG = "TRUE", SHREG_EXTRACT = "NO" *)
  FDRE #(
   .INIT (INITIALISE[0])
  ) data_sync_reg1 (
  .C  (clk),
  .D  (data_sync0),
  .Q  (data_sync1),
  .CE (1'b1),
  .R  (1'b0)
  );
 
  (* ASYNC_REG = "TRUE", SHREG_EXTRACT = "NO" *)
  FDRE #(
   .INIT (INITIALISE[0])
  ) data_sync_reg2 (
  .C  (clk),
  .D  (data_sync1),
  .Q  (data_sync2),
  .CE (1'b1),
  .R  (1'b0)
  );
 
  (* ASYNC_REG = "TRUE", SHREG_EXTRACT = "NO" *)
  FDRE #(
   .INIT (INITIALISE[0])
  ) data_sync_reg3 (
  .C  (clk),
  .D  (data_sync2),
  .Q  (data_sync3),
  .CE (1'b1),
  .R  (1'b0)
  );
 
  (* ASYNC_REG = "TRUE", SHREG_EXTRACT = "NO" *)
  FDRE #(
   .INIT (INITIALISE[0])
  ) data_sync_reg4 (
  .C  (clk),
  .D  (data_sync3),
  .Q  (data_sync4),
  .CE (1'b1),
  .R  (1'b0)
  );
 
  assign data_out = data_sync4;
 
 
endmodule