add_sub_vdh.tdf

CPLD VHDL CODE非常好的参考资料

--lpm_add_sub CARRY_CHAIN=MANUAL CARRY_CHAIN_LENGTH=48 DEVICE_FAMILY=MAX3000A LPM_DIRECTION=ADD LPM_REPRESENTATION=UNSIGNED LPM_WIDTH=15 ONE_INPUT_IS_CONSTANT=YES cin dataa datab result
--VERSION_BEGIN 4.0 cbx_lpm_add_sub 2003:11:17:16:32:08:SJ cbx_mgl 2004:01:13:14:00:54:SJ cbx_stratix 2004:02:27:16:26:40:SJ  VERSION_END


--  Copyright (C) 1988-2004 Altera Corporation
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FUNCTION carry_sum (cin, sin)
RETURNS ( cout, sout);

--synthesis_resources = lut 16 
SUBDESIGN add_sub_vdh
( 
	cin	:	input;
	dataa[14..0]	:	input;
	datab[14..0]	:	input;
	result[14..0]	:	output;
) 
VARIABLE 
	add_sub_cella[14..0] : carry_sum;
	external_cin_cell : carry_sum;
	main_cin_wire	: WIRE;

BEGIN 
	add_sub_cella[0].cin = ((datab[0..0] & main_cin_wire) # (dataa[0..0] & (datab[0..0] $ main_cin_wire)));
	add_sub_cella[1].cin = ((datab[1..1] & add_sub_cella[0].cout) # (dataa[1..1] & (datab[1..1] $ add_sub_cella[0].cout)));
	add_sub_cella[2].cin = ((datab[2..2] & add_sub_cella[1].cout) # (dataa[2..2] & (datab[2..2] $ add_sub_cella[1].cout)));
	add_sub_cella[3].cin = ((datab[3..3] & add_sub_cella[2].cout) # (dataa[3..3] & (datab[3..3] $ add_sub_cella[2].cout)));
	add_sub_cella[4].cin = ((datab[4..4] & add_sub_cella[3].cout) # (dataa[4..4] & (datab[4..4] $ add_sub_cella[3].cout)));
	add_sub_cella[5].cin = ((datab[5..5] & add_sub_cella[4].cout) # (dataa[5..5] & (datab[5..5] $ add_sub_cella[4].cout)));
	add_sub_cella[6].cin = ((datab[6..6] & add_sub_cella[5].cout) # (dataa[6..6] & (datab[6..6] $ add_sub_cella[5].cout)));
	add_sub_cella[7].cin = ((datab[7..7] & add_sub_cella[6].cout) # (dataa[7..7] & (datab[7..7] $ add_sub_cella[6].cout)));
	add_sub_cella[8].cin = ((datab[8..8] & add_sub_cella[7].cout) # (dataa[8..8] & (datab[8..8] $ add_sub_cella[7].cout)));
	add_sub_cella[9].cin = ((datab[9..9] & add_sub_cella[8].cout) # (dataa[9..9] & (datab[9..9] $ add_sub_cella[8].cout)));
	add_sub_cella[10].cin = ((datab[10..10] & add_sub_cella[9].cout) # (dataa[10..10] & (datab[10..10] $ add_sub_cella[9].cout)));
	add_sub_cella[11].cin = ((datab[11..11] & add_sub_cella[10].cout) # (dataa[11..11] & (datab[11..11] $ add_sub_cella[10].cout)));
	add_sub_cella[12].cin = ((datab[12..12] & add_sub_cella[11].cout) # (dataa[12..12] & (datab[12..12] $ add_sub_cella[11].cout)));
	add_sub_cella[13].cin = ((datab[13..13] & add_sub_cella[12].cout) # (dataa[13..13] & (datab[13..13] $ add_sub_cella[12].cout)));
	add_sub_cella[14].cin = ((datab[14..14] & add_sub_cella[13].cout) # (dataa[14..14] & (datab[14..14] $ add_sub_cella[13].cout)));
	add_sub_cella[0].sin = (dataa[0..0] $ (datab[0..0] $ main_cin_wire));
	add_sub_cella[1].sin = (dataa[1..1] $ (datab[1..1] $ add_sub_cella[0].cout));
	add_sub_cella[2].sin = (dataa[2..2] $ (datab[2..2] $ add_sub_cella[1].cout));
	add_sub_cella[3].sin = (dataa[3..3] $ (datab[3..3] $ add_sub_cella[2].cout));
	add_sub_cella[4].sin = (dataa[4..4] $ (datab[4..4] $ add_sub_cella[3].cout));
	add_sub_cella[5].sin = (dataa[5..5] $ (datab[5..5] $ add_sub_cella[4].cout));
	add_sub_cella[6].sin = (dataa[6..6] $ (datab[6..6] $ add_sub_cella[5].cout));
	add_sub_cella[7].sin = (dataa[7..7] $ (datab[7..7] $ add_sub_cella[6].cout));
	add_sub_cella[8].sin = (dataa[8..8] $ (datab[8..8] $ add_sub_cella[7].cout));
	add_sub_cella[9].sin = (dataa[9..9] $ (datab[9..9] $ add_sub_cella[8].cout));
	add_sub_cella[10].sin = (dataa[10..10] $ (datab[10..10] $ add_sub_cella[9].cout));
	add_sub_cella[11].sin = (dataa[11..11] $ (datab[11..11] $ add_sub_cella[10].cout));
	add_sub_cella[12].sin = (dataa[12..12] $ (datab[12..12] $ add_sub_cella[11].cout));
	add_sub_cella[13].sin = (dataa[13..13] $ (datab[13..13] $ add_sub_cella[12].cout));
	add_sub_cella[14].sin = (dataa[14..14] $ (datab[14..14] $ add_sub_cella[13].cout));
	external_cin_cell.cin = cin;
	external_cin_cell.sin = B"0";
	main_cin_wire = external_cin_cell.cout;
	result[] = add_sub_cella[].sout;
END;
--VALID FILE