/***********************************************************************************                                                                                 **  This verilog file is a part of the Boundary Scan Implementation and comes in   **  a pack with several other files. It is fully IEEE 1149.1 compliant.            **  For details check www.opencores.org (pdf files, bsdl file, etc.)               **                                                                                 **  Copyright (C) 2000 Igor Mohor (igorm@opencores.org) and OPENCORES.ORG          **                                                                                 **  This program is free software; you can redistribute it and/or modify           **  it under the terms of the GNU General Public License as published by           **  the Free Software Foundation; either version 2 of the License, or              **  (at your option) any later version.                                            **                                                                                 **  See the file COPYING for the full details of the license.                      **                                                                                 **  OPENCORES.ORG is looking for new open source IP cores and developers that      **  would like to help in our mission.                                             **                                                                                 ***********************************************************************************//***********************************************************************************                                                                                 **	  I/O Control Cell:                                                             **                                                                                 **	  OutputControl: Output Control from on-chip logic                              **	  FromPreviousBSCell: Value from previous boundary scan cell                    **	  ToNextBSCell: Value for next boundary scan cell                               **	  CaptureDR, ShiftDR, UpdateDR: TAP states                                      **	  extest: Instruction Register Command                                          **	  TCK: Test Clock                                                               **                                                                                 **	  Output Enable can be generated by running CaptureDR-UpdateDR sequence	or      **	  shifting data for the exact number of time                                    **                                                                                 ***********************************************************************************/// This is not a top module module ControlCell( OutputControl, FromPreviousBSCell, CaptureDR, ShiftDR, UpdateDR, extest, TCK, ToNextBSCell, ToOutputEnable);input  OutputControl;input  FromPreviousBSCell;input  CaptureDR;input  ShiftDR;input  UpdateDR;input  extest;input  TCK;reg Latch;output ToNextBSCell;output ToOutputEnable;reg    ToNextBSCell;reg ShiftedControl;wire SelectedInput = CaptureDR? OutputControl : FromPreviousBSCell;always @ (posedge TCK)begin	if(CaptureDR | ShiftDR)		Latch<=SelectedInput;endalways @ (negedge TCK)begin	ToNextBSCell<=Latch;endalways @ (negedge TCK)begin	if(UpdateDR)		ShiftedControl<=ToNextBSCell;endassign ToOutputEnable = extest? ShiftedControl : OutputControl;endmodule	// ControlCell