/**************************************************************************
 *                                                                        *
 *               Copyright (C) 1994, Silicon Graphics, Inc.               *
 *                                                                        *
 *  These coded instructions, statements, and computer programs  contain  *
 *  unpublished  proprietary  information of Silicon Graphics, Inc., and  *
 *  are protected by Federal copyright  law.  They  may not be disclosed  *
 *  to  third  parties  or copied or duplicated in any form, in whole or  *
 *  in part, without the prior written consent of Silicon Graphics, Inc.  *
 *                                                                        *
 *************************************************************************/

// $Id: at_ctw2.v,v 1.1 2002/03/28 00:26:12 berndt Exp $

////////////////////////////////////////////////////////////////////////
//
// Project Reality
//
// module:      at_ctw2
// description: Counter for attribute buffers.
//
// designer:    Phil Gossett
// date:        9/6/94
//
////////////////////////////////////////////////////////////////////////

module at_ctw2 (clk, rst, enb, a, b);

input clk;
input rst;
input enb;

output a;
output b;

reg z;

// counter
always @(posedge clk or posedge rst)
begin
	if (rst == 1'b1)
		z <= 1'b0;	// 0
	else
		z <= enb ? !z : z;
end

assign a = enb && !z;
assign b = enb &&  z;

endmodule // at_ctw2