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發表於 2009-1-10 22:13:00
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- FWRITE: process (CLR, WCLK)
, c9 g! r) b' Q/ G$ h; u# E6 ^ - begin
5 w/ u8 G3 S0 s& A0 O, b - if CLR = '1' then( D7 y: s/ W$ f5 D! s
- for INDEX in fmax downto 0 loop! i L6 o/ G7 z" A# m8 c1 G7 m
- fifo_array(INDEX) <= (others => '0');- T3 H% g, r, ~3 c& q4 ~2 ?
- end loop;* k$ `6 y& I( O3 E4 K% M1 Y& W
- WR_PTR <= 0;& y' B- g4 f% S' w/ |
- elsif rising_edge(WCLK) then+ r1 y6 J+ C' l! _! y# ?
- if WE = '1' and count<depth then) \* ^; G, n* Y, Z3 N5 f/ _4 w
- fifo_array(WR_PTR) <= DATA;! x) R2 ^. ^; t% K
- -- move pointer
6 h- u1 p7 W- h% `8 s - if WR_PTR=fmax then
5 C- G, E' G7 O; @: p - WR_PTR <= 0;
7 f% v* w. i' \+ G - else WR_PTR <= WR_PTR + 1;& y v, b+ N8 \8 Z
- end if;
: T4 Z4 d- t! \6 b - end if;1 N7 R# y" W* S8 s% Q8 {
- end if;1 d3 Q2 u7 c% j; X5 C' B
- end process;
3 B8 A0 b. _: ]5 x) ?/ F - FREAD: process (CLR, RCLK)" G @5 K. D' x2 Q. q) a
- begin
. X! I5 R* j Y! F6 A - if CLR = '1' then) R& ~' W/ E# h5 B6 Q2 _' D( w
- RD_PTR <= 0;
4 _+ w* e% y% U0 h: ~ - elsif falling_edge(RCLK) then, I" W9 c7 J' C' Q: `
- if RE = '1' and count>0 then
8 o$ L' z: C7 y6 k j - Q <= fifo_array(RD_PTR);
/ j2 h- f) a% L4 l# O - -- move pointer 9 F0 t E2 Y' o
- if RD_PTR=fmax then 1 J* o' L, v' f
- RD_PTR <= 0;
/ R0 y- [7 s( d4 J$ v - else RD_PTR <= RD_PTR + 1;
: x7 v- ], w+ E& J: C3 X - end if;
" `( z8 c; d8 g - end if;0 _/ n' y' f- s# Y( k" ?
- end if;! e& l- J' ?* j1 [* n$ h, ]- e
- end process;
/ l& H- b3 I- B U$ Z$ b, F - end architecture;
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