--a_fefifo ALLOW_RWCYCLE_WHEN_FULL="OFF" LPM_NUMWORDS=16 lpm_widthad=4 OVERFLOW_CHECKING="ON" UNDERFLOW_CHECKING="ON" aclr clock empty full rreq sclr usedw_out wreq
--VERSION_BEGIN 7.1 cbx_cycloneii 2007:01:23:09:39:40:SJ cbx_fifo_common 2006:03:14:11:59:42:SJ cbx_lpm_add_sub 2007:01:08:11:15:18:SJ cbx_lpm_compare 2007:02:05:11:33:54:SJ cbx_lpm_counter 2007:03:22:23:17:10:SJ cbx_lpm_decode 2006:11:21:10:27:00:SJ cbx_mgl 2007:04:03:14:06:46:SJ cbx_stratix 2007:04:12:16:43:52:SJ cbx_stratixii 2007:02:12:17:08:26:SJ  VERSION_END


-- Copyright (C) 1991-2007 Altera Corporation
--  Your use of Altera Corporation's design tools, logic functions 
--  and other software and tools, and its AMPP partner logic 
--  functions, and any output files from any of the foregoing 
--  (including device programming or simulation files), and any 
--  associated documentation or information are expressly subject 
--  to the terms and conditions of the Altera Program License 
--  Subscription Agreement, Altera MegaCore Function License 
--  Agreement, or other applicable license agreement, including, 
--  without limitation, that your use is for the sole purpose of 
--  programming logic devices manufactured by Altera and sold by 
--  Altera or its authorized distributors.  Please refer to the 
--  applicable agreement for further details.


FUNCTION cntr_9d7 (aclr, clock, cnt_en, sclr, updown)
RETURNS ( q[3..0]);

--synthesis_resources = lut 6 
SUBDESIGN a_fefifo_66f
( 
	aclr	:	input;
	clock	:	input;
	empty	:	output;
	full	:	output;
	rreq	:	input;
	sclr	:	input;
	usedw_out[3..0]	:	output;
	wreq	:	input;
) 
VARIABLE 
	b_full : dffe;
	b_non_empty : dffe;
	count_usedw : cntr_9d7;
	equal_af1w[3..0]	: WIRE;
	equal_one[3..0]	: WIRE;
	is_almost_empty0	: WIRE;
	is_almost_empty1	: WIRE;
	is_almost_empty2	: WIRE;
	is_almost_empty3	: WIRE;
	is_almost_full0	: WIRE;
	is_almost_full1	: WIRE;
	is_almost_full2	: WIRE;
	is_almost_full3	: WIRE;
	usedw[3..0]	: WIRE;
	valid_rreq	: WIRE;
	valid_wreq	: WIRE;

BEGIN 
	b_full.clk = clock;
	b_full.clrn = (! aclr);
	b_full.d = ((b_full.q & (b_full.q $ (sclr # rreq))) # (((! b_full.q) & b_non_empty.q) & ((! sclr) & ((is_almost_full3 & wreq) & (! rreq)))));
	b_non_empty.clk = clock;
	b_non_empty.clrn = (! aclr);
	b_non_empty.d = (((b_full.q & (b_full.q $ sclr)) # (((! b_non_empty.q) & wreq) & (! sclr))) # (((! b_full.q) & b_non_empty.q) & (((! b_full.q) & b_non_empty.q) $ (sclr # ((is_almost_empty3 & rreq) & (! wreq))))));
	count_usedw.aclr = aclr;
	count_usedw.clock = clock;
	count_usedw.cnt_en = (valid_wreq $ valid_rreq);
	count_usedw.sclr = sclr;
	count_usedw.updown = valid_wreq;
	empty = (! b_non_empty.q);
	equal_af1w[] = ( B"0", B"0", B"0", B"0");
	equal_one[] = ( B"1", B"1", B"1", B"0");
	full = b_full.q;
	is_almost_empty0 = (usedw[0..0] $ equal_one[0..0]);
	is_almost_empty1 = ((usedw[1..1] $ equal_one[1..1]) & is_almost_empty0);
	is_almost_empty2 = ((usedw[2..2] $ equal_one[2..2]) & is_almost_empty1);
	is_almost_empty3 = ((usedw[3..3] $ equal_one[3..3]) & is_almost_empty2);
	is_almost_full0 = (usedw[0..0] $ equal_af1w[0..0]);
	is_almost_full1 = ((usedw[1..1] $ equal_af1w[1..1]) & is_almost_full0);
	is_almost_full2 = ((usedw[2..2] $ equal_af1w[2..2]) & is_almost_full1);
	is_almost_full3 = ((usedw[3..3] $ equal_af1w[3..3]) & is_almost_full2);
	usedw[] = count_usedw.q[];
	usedw_out[] = usedw[];
	valid_rreq = (rreq & b_non_empty.q);
	valid_wreq = (wreq & (! b_full.q));
END;
--VALID FILE