cmpr_83b.tdf

《FPGA嵌入式应用系统开发典型实例》-书的光盘资料

--lpm_compare DEVICE_FAMILY=Cyclone LPM_REPRESENTATION=SIGNED LPM_WIDTH=9 ONE_INPUT_IS_CONSTANT=YES aleb dataa datab
--VERSION_BEGIN 4.0 cbx_lpm_compare 2003:09:10:10:27:44:SJ cbx_mgl 2004:01:13:14:00:54:SJ  VERSION_END


--  Copyright (C) 1988-2004 Altera Corporation
--  Any  megafunction  design,  and related netlist (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,  netlist,  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, netlist,
--  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.



--synthesis_resources = lut 13 
SUBDESIGN cmpr_83b
( 
	aleb	:	output;
	dataa[8..0]	:	input;
	datab[8..0]	:	input;
) 
VARIABLE
	aeb_int	:	WIRE;
	alb_int	:	WIRE;
	dataa_int[8..0]	:	WIRE;
	datab_int[8..0]	:	WIRE;
BEGIN 
	dataa_int[] = ( !dataa[8] , dataa[7..0]);
	datab_int[] = ( !datab[8] , datab[7..0]);
	IF (dataa_int[] == datab_int[]) THEN
		aeb_int = VCC;
		alb_int = GND;
	ELSIF (dataa_int[] < datab_int[]) THEN
		alb_int = VCC;
		aeb_int = GND;
	ELSE
		aeb_int = GND;
		alb_int = GND;
	END IF;
	aleb = alb_int # aeb_int;
END;
--VALID FILE