source: XOpenSparcT1/trunk/Xilinx/ddr2_idelay_ctrl.v @ 10

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//*****************************************************************************
//   ____  ____
//  /   /\/   /
// /___/  \  /    Vendor: Xilinx
// \   \   \/     Version: 3.6
//  \   \         Application: MIG
//  /   /         Filename: ddr2_idelay_ctrl.v
// /___/   /\     Date Last Modified: $Date: 2010/06/29 12:03:43 $
// \   \  /  \    Date Created: Wed Aug 16 2006
//  \___\/\___\
//
//Device: Virtex-5
//Design Name: DDR2
//Purpose:
//   This module instantiates the IDELAYCTRL primitive of the Virtex-5 device
//   which continuously calibrates the IDELAY elements in the region in case of
//   varying operating conditions. It takes a 200MHz clock as an input
//Reference:
//Revision History:
//   Rev 1.1 - Parameter IODELAY_GRP added and constraint IODELAY_GROUP added
//             on IOELAYCTRL primitive. Generate logic on IDELAYCTRL removed
//             since tools will replicate idelactrl primitives.PK. 11/27/08
//*****************************************************************************

`timescale 1ns/1ps

module ddr2_idelay_ctrl #
  (
   // Following parameters are for 72-bit RDIMM design (for ML561 Reference
   // board design). Actual values may be different. Actual parameters values
   // are passed from design top module dram module. Please refer to
   // the dram module for actual values.
   parameter IODELAY_GRP     = "IODELAY_MIG"
   )

  (
   input  clk200,
   input  rst200,
   output idelay_ctrl_rdy
   );

  (* IODELAY_GROUP = IODELAY_GRP *) IDELAYCTRL u_idelayctrl
    (
     .RDY(idelay_ctrl_rdy),
     .REFCLK(clk200),
     .RST(rst200)
     );

endmodule