a_fefifo_7cf.tdf

niosII基础上实现的嵌入式网络驱动

--a_fefifo ALLOW_RWCYCLE_WHEN_FULL="OFF" LPM_NUMWORDS=64 lpm_widthad=6 OVERFLOW_CHECKING="OFF" UNDERFLOW_CHECKING="OFF" aclr clock empty full rreq sclr usedw_out wreq
--VERSION_BEGIN 5.0 cbx_cycloneii 2004:12:20:14:28:52:SJ cbx_fifo_common 2004:12:13:14:26:24:SJ cbx_lpm_add_sub 2005:04:12:13:30:42:SJ cbx_lpm_compare 2004:11:30:11:30:40:SJ cbx_lpm_counter 2005:02:02:04:37:10:SJ cbx_lpm_decode 2004:12:13:14:19:12:SJ cbx_mgl 2005:05:19:13:51:58:SJ cbx_stratix 2005:11:01:14:36:46:SJ cbx_stratixii 2004:12:22:13:27:12:SJ  VERSION_END


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FUNCTION cntr_rj7 (aclr, clock, cnt_en, sclr, updown)
RETURNS ( q[5..0]);

--synthesis_resources = lut 8 reg 6 
SUBDESIGN a_fefifo_7cf
( 
	aclr	:	input;
	clock	:	input;
	empty	:	output;
	full	:	output;
	rreq	:	input;
	sclr	:	input;
	usedw_out[5..0]	:	output;
	wreq	:	input;
) 
VARIABLE 
	b_full : dffe;
	b_non_empty : dffe;
	count_usedw : cntr_rj7;
	equal_af1[5..0]	: WIRE;
	equal_one[5..0]	: WIRE;
	is_almost_empty0	: WIRE;
	is_almost_empty1	: WIRE;
	is_almost_empty2	: WIRE;
	is_almost_empty3	: WIRE;
	is_almost_empty4	: WIRE;
	is_almost_empty5	: WIRE;
	is_almost_full0	: WIRE;
	is_almost_full1	: WIRE;
	is_almost_full2	: WIRE;
	is_almost_full3	: WIRE;
	is_almost_full4	: WIRE;
	is_almost_full5	: WIRE;
	usedw[5..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_full5 & 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_empty5 & 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_af1[] = ( B"0", B"0", B"0", B"0", B"0", B"0");
	equal_one[] = ( B"1", B"1", 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_empty4 = ((usedw[4..4] $ equal_one[4..4]) & is_almost_empty3);
	is_almost_empty5 = ((usedw[5..5] $ equal_one[5..5]) & is_almost_empty4);
	is_almost_full0 = (usedw[0..0] $ equal_af1[0..0]);
	is_almost_full1 = ((usedw[1..1] $ equal_af1[1..1]) & is_almost_full0);
	is_almost_full2 = ((usedw[2..2] $ equal_af1[2..2]) & is_almost_full1);
	is_almost_full3 = ((usedw[3..3] $ equal_af1[3..3]) & is_almost_full2);
	is_almost_full4 = ((usedw[4..4] $ equal_af1[4..4]) & is_almost_full3);
	is_almost_full5 = ((usedw[5..5] $ equal_af1[5..5]) & is_almost_full4);
	usedw[] = count_usedw.q[];
	usedw_out[] = usedw[];
	valid_rreq = rreq;
	valid_wreq = wreq;
END;
--VALID FILE