-- Copyright (C) 1991-1997 Altera Corporation-- Any megafunction design, and related net list (encrypted or decrypted),-- support information, device programming or simulation file, and any other-- associated documentation or information provided by Altera or a partner-- under Altera's Megafunction Partnership Program may be used only to-- program PLD devices (but not masked PLD devices) from Altera.  Any other-- use of such megafunction design, net list, support information, device-- programming or simulation file, or any other related documentation or-- information is prohibited for any other purpose, including, but not-- limited to modification, reverse engineering, de-compiling, or use with-- any other silicon devices, unless such use is explicitly licensed under-- a separate agreement with Altera or a megafunction partner.  Title to-- the intellectual property, including patents, copyrights, trademarks,-- trade secrets, or maskworks, embodied in any such megafunction design,-- net list, support information, device programming or simulation file, or-- any other related documentation or information provided by Altera or a-- megafunction partner, remains with Altera, the megafunction partner, or-- their respective licensors.  No other licenses, including any licenses-- needed under any third party's intellectual property, are provided herein.-- MAX+plus II Include File-- Version 8.0 6/10/97-- Created: Wed Aug 20 23:34:45 1997FUNCTION nco (sysclk, frequency[19..0], offset[8..0], start, stop)    WITH (POLARITY)    RETURNS (wave[7..0], running, zerocross);