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發表於 2009-6-11 12:43:50
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ODDR2 #(+ V- z5 ?( s6 i$ q* g; L2 b
.DDR_ALIGNMENT("NONE"), // Sets output alignment to "NONE", "C0" or "C1" ( d q) @4 q) [# A0 g$ t( b" N
.INIT(1'b0), // Sets initial state of the Q output to 1'b0 or 1'b15 l7 z+ f/ v9 a$ a" w1 w& R
.SRTYPE("SYNC") // Specifies "SYNC" or "ASYNC" set/reset
9 Y% A; ^, N, D ) ODDR2_inst (. J$ M+ S) b: H- p3 Y {
.Q(oVGA_CLOCK), // 1-bit DDR output data/ Q9 `* I/ ? Q: Y) w
.C0(clk), // 1-bit clock input
, d' T4 u6 m0 S .C1(~clk), // 1-bit clock input
: F* X9 o# S4 y! G .CE(1'b1), // 1-bit clock enable input
, `1 a% }, \/ b4 F& u" o .D0(1'b0), // 1-bit data input (associated with C0)
7 Q- K/ K. |) I( U6 ] .D1(1'b1), // 1-bit data input (associated with C1)
' L" x3 A$ o. B .R(1'b0), // 1-bit reset input
/ B5 \! r1 k, _5 A [: L" l9 E5 y .S(1'b0) // 1-bit set input* w6 c, ]6 O# p
);
; E9 k* A; m+ J( N+ t) t# d 3 M7 e- A: w" b7 `7 a
always @(posedge clk)2 u, L" f7 d% v3 ^! A, r6 {# l
begin& n5 d3 p' J; m3 W/ m" N; w+ t
oVGA_SYNC <= oRequest;7 ^ q K/ t* V# I7 H
end ' E w8 p' ?( n7 e5 c. b4 r/ A
7 ^$ s4 T; s- B9 s
always @(posedge clk)
- W/ `6 m, F6 j( @/ i7 n4 c0 rbegin
; _; J! {: H# Q" E# |1 E( s* Z if (rst)
8 d" r+ O9 L6 ?) w oRequest <= 1'b0;
7 F% w- i) t4 P! t* D9 Y% a else begin
; L3 o% n) d: m0 ]% R% N if (h_cnt >= (X_START-2) && h_cnt< (X_START+H_SYNC_ACT-2) && v_cnt>=Y_START && v_cnt<(Y_START+V_SYNC_ACT))2 ^6 z7 F% E4 J$ ?
oRequest <= 1'b1;
: K! R% n. U0 t6 v8 c# C- s7 T: ~ else
& }5 A" |1 d7 |/ q A$ H oRequest <= 1'b0;
% H5 o( q: w7 a4 R2 o5 ~/ J. p end; N7 X, R% k% X/ C- J+ M
end4 X0 v) [$ Q, R; F
& D, |' e/ G5 A; N// H_Sync Generator, Ref. 25.175 MHz Clock2 Y4 ^" J+ t i
always @(posedge clk)8 n2 A: U* E" z1 g4 W/ j1 r/ C
begin+ H4 f! y( I: w% y+ s4 K
if (rst) begin
$ I% S; x! @4 ?" P5 [: l8 V h_cnt <= 12'd0;0 P, G& v( }$ B5 L/ `
oVGA_H_SYNC <= 1'b0;- r/ b6 I3 q% J$ D, |, K ^
end
7 W- L7 O, x! S4 X" O+ k' H else begin: o8 g% K" y" A8 r l! K g! U: g
// H_Sync Counter2 u9 P. u4 P% `3 t) [
if (h_cnt < (H_SYNC_TOTAL-1) )
# z) D; [# B: q2 b& W# U. D h_cnt <= h_cnt + 12'd1;
: W" S0 h8 U( \; m, z0 i else% `- o5 @' \& z
h_cnt <= 12'd0;
* s# a4 ^, U; p
, a4 t6 p- h9 q+ U9 J! }" x // H_Sync Generator+ f0 V2 V( [- H \. |
if( h_cnt < H_SYNC_CYC )! [/ Q1 L- V0 ] s$ U9 E, m
oVGA_H_SYNC <= 0;& a+ ?( O; t0 q$ y, H t! g1 F
else
4 e! t. p, X4 I: |3 D" P H oVGA_H_SYNC <= 1;0 l0 C6 m8 `: z+ k& R' R
end
6 G6 J7 c' N! v- ]+ M3 |end
: O! O" P" G1 ?( r( L
" I/ u% X* P$ q$ I* |always @(posedge clk)% N1 {* m7 u5 @7 D
begin4 q0 g; I1 l/ s* J, o) S4 I
if (rst) begin
; m( ~7 U$ ]5 Q' Y' W9 h/ E& x' S. i v_cnt <= 12'd0;4 j( w8 Z: w( Z ^, Z) i" q
oVGA_V_SYNC <= 1'b0;( g+ k9 E a0 b
end4 m. y8 ^! |7 ]+ y
else' A3 D1 _* {3 X u) t4 @4 q
if (h_cnt == 0 )
6 a9 g6 }3 R8 r# B* ? begin+ }9 W; m" I- B! e1 }
// V_Sync Counter+ E; _6 _+ n/ d2 [( V
if (v_cnt < (V_SYNC_TOTAL-1))
! |: ^. ?: r2 x: h* U z9 Q h2 R v_cnt <= v_cnt + 12'd1;" m+ W2 c$ W; r4 B
else* B& |$ n# ?, M3 [6 E
v_cnt <= 12'd0;6 {: \* `' |5 w" f& u
// V_Sync Generator
* G8 n6 b+ M) }9 [ if (v_cnt < V_SYNC_CYC)1 i* E. A( q0 L/ x
oVGA_V_SYNC <= 1'b0;- {: d, I5 o/ {
else8 O" j% J' n2 M7 N* q. U
oVGA_V_SYNC <= 1'b1;
& a: J" j' Z( X2 @ i! W1 U end
7 c! W" Z0 [2 f* \end0 y7 T [- `6 e2 D
. N: u7 G- h) q0 H) g" k& S" k
0 o, ~) N+ l& x9 @* ]: @
endmodule |
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