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回復 #1 tom218 的帖子
問題不夠清楚哦?????要VHDL還是Verilog??? 8bit的count有很多種,要up count還是down count?????要有加reset還是....????5 `: @7 @8 n# ^3 Z
我給你幾個參考.& n% D" g" M3 R
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VHDL count* Q, {$ q: c0 I+ z7 l; U5 m7 Y
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process (clock, reset) 3 z" b6 U* Q( U+ P, i6 @
begin
( _! M3 G) ^0 P; T5 u2 y; G if reset='1' then : |9 u) n2 m3 [' L: J! L5 K( Y
count <= (others => '0');) o$ Y$ @4 P# t( Y& G& |
elsif clock='1' and clock'event then
# B! ]8 e; C _( r0 B/ I if clock_enable='1' then8 t& m: T, ^/ _, @3 L
count <= count + 1;1 |# ^/ C1 O- [5 o1 {4 e% a
end if;
" H! r5 R$ y3 K5 ~& x end if; z- ^; J( h2 R7 Y% ?4 }8 [8 a
end process;! W; l4 M+ H! K% @+ d
$ P/ @1 h+ L! t3 }Verilog count+ X- ]: ^) a* L) E g+ K1 U
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reg [7:0] count;
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always @(posedge clk)
9 u! p( b, y6 b# t. }- H) U5 c if (clock_enable)
& M- ?2 l+ ^$ v count <= count + 1;4 V# A4 A9 w4 e) T3 \6 j; a
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VHDL比較器! z$ U- o+ ?# I r K+ a) I
process(clock)$ i/ N8 i& P; G6 _1 [
begin2 U6 ~5 i8 X2 ]8 d
if (clock'event and clock ='1') then 9 R( p( I6 _9 H- U; f9 H
if ( input1 > input2 ) then
/ U E" q9 Z$ s$ ~ output <= '1';( e: p; B' m1 U
else 1 T' E/ [# G/ l* e2 q$ r
output <= '0';
w$ ?3 n8 a B; }& Z end if;) l# L1 t+ k7 {
end if; 0 j. U7 Z; u2 _4 ]" O0 _. z
end process;
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process(clock)# ]5 F+ w; D7 P$ ^- y
begin- O0 O# h4 j( A/ m
if (clock'event and clock ='1') then / |$ ~$ e6 Y; B
if ( input1 < input2 ) then # w% S; R$ A) k' D) n3 W
output <= '1';$ r. d# h1 F) M% o2 T( ~
else
4 A. C5 [" C3 ~) q2 E7 F3 d output <= '0';* X# N9 S7 s" @7 Y" U& N/ q: P
end if;
, T% c c6 X( k6 L$ w5 P end if; / e1 s4 K( K+ z4 V* u, G
end process;
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Verilog比較器$ E, Y o5 Q" v( O9 x
reg output;# s" R G1 t6 G" U1 J
5 |+ z) a' m8 O% o/ X7 N# ?2 e always @(posedge clock)
+ R( `5 x" I- E" P9 W3 P0 ] if (input1 > input2)
0 c, P r1 b2 L) T& \# Y! _8 ] output <= 1'b1;/ D* N3 x$ @8 s% |- E( T
else
8 q! g6 V. b6 e; g; n0 z4 J output <= 1'b0;
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8 ^2 R5 E4 Q3 U8 ]9 zreg output;0 |; A0 u" h, e, i: ^
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always @(posedge clock)
; t) V! c7 {$ \, \' {, h, ^2 e5 v3 y if (input1 < input2)
. Y- [5 a5 u) Y4 D output <= 1'b1;
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output <= 1'b0;
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希望有幫助^_^ |
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