//
// iplrom_304k.v
//   IPL-ROM for OCM-PLD
//   Initial Program Loader for Cyclone & EPCS (Altera)
//   Revision 3.00
//
// Copyright (c) 2021-2022 Takayuki Hara
// All rights reserved.
//
// Redistribution and use of this source code or any derivative works, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. Redistributions may not be sold, nor may they be used in a commercial
//    product or activity without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//

module iplrom (
	input			clk,
	input	[15:0]	adr,
	output	[ 7:0]	dbi
);
	reg		[ 7:0]	ff_dbi;

	always @( posedge clk ) begin
		case( adr[ 9:0] )
