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發表於 2009-6-11 12:43:50
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ODDR2 #(
7 [1 v' N; X _ .DDR_ALIGNMENT("NONE"), // Sets output alignment to "NONE", "C0" or "C1" 4 g l! m1 k: ]: K$ }8 W+ h2 Y
.INIT(1'b0), // Sets initial state of the Q output to 1'b0 or 1'b1
5 Y1 X( {6 @4 r! n8 |( M* T+ ~2 } .SRTYPE("SYNC") // Specifies "SYNC" or "ASYNC" set/reset
! w" ~: b& B/ ]) v4 T ) ODDR2_inst (
6 P7 e3 S+ k8 V6 @- J. C+ H1 H .Q(oVGA_CLOCK), // 1-bit DDR output data
$ R. u7 J9 Z; A, y' a; N .C0(clk), // 1-bit clock input# I$ X* A: i: X! `+ @* |* i4 U$ ]
.C1(~clk), // 1-bit clock input e' J7 w0 K: _- y7 H, x
.CE(1'b1), // 1-bit clock enable input$ I" n8 {5 `0 X& n* s/ }7 s
.D0(1'b0), // 1-bit data input (associated with C0)$ l" _& C" u4 C8 T3 \
.D1(1'b1), // 1-bit data input (associated with C1)
1 J* l& X9 N! k( @1 I7 p .R(1'b0), // 1-bit reset input7 C Q1 {% g( t
.S(1'b0) // 1-bit set input
) x1 q0 M6 `& ~5 u0 A+ g );) D% u6 {8 s& r
- A+ [; ]5 T j3 d* R
always @(posedge clk)
" t2 p% n/ p* K5 b6 Lbegin9 W u6 w- V/ {! k
oVGA_SYNC <= oRequest;0 K3 ]7 k4 n1 x( P L! X
end ! A2 U+ z; X/ L# p
4 y+ {, W; o! [- n, z4 c" [
always @(posedge clk)
; E Y; o4 E0 X; Vbegin( G) d$ }2 Q& b+ }
if (rst)
$ G' {' r) E9 ]; U oRequest <= 1'b0;
, ]2 Y4 l% \' t) {/ p else begin
4 Y, p: C! P8 A1 u. a8 T 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))$ P4 f% l7 C0 ] `
oRequest <= 1'b1;9 O3 K" d, m- c& m/ V; E+ `1 A
else
; m) y/ V/ i8 n oRequest <= 1'b0;
- s" O+ I7 [. W8 c3 g) X4 W, ] end
5 ^. R1 e0 l5 Y' }4 E6 x0 |; C7 ]end$ L/ g( P1 Z! C
% s% S! d q; k3 P6 i$ U% X- w" ]// H_Sync Generator, Ref. 25.175 MHz Clock& Q4 I! B; u3 F( w
always @(posedge clk)
" \! u0 f5 i+ G2 W# u' o4 w( ~4 Rbegin: M" t% g. k. i* P
if (rst) begin
: B! D. N5 ]( W0 \) p. n3 m% r h_cnt <= 12'd0; v0 ~+ W% r1 l8 [
oVGA_H_SYNC <= 1'b0;
; u, E& O2 L: R6 h8 w end! [$ O5 F7 V: j4 f% S+ ^
else begin
5 V( h4 _% J9 W5 f! D( t0 `) } // H_Sync Counter
! v* s2 ~* y% u; R- |1 [ if (h_cnt < (H_SYNC_TOTAL-1) )
; S9 }* X) R/ W5 H0 W: H h_cnt <= h_cnt + 12'd1;2 a* W. t5 F9 }" m6 i1 K3 s
else* B7 N, q1 L. g: ?& b% H
h_cnt <= 12'd0;$ a$ g: @9 [8 Y- H
/ v l$ }! Y! Q' w
// H_Sync Generator8 X! q) S1 m# F$ R$ E
if( h_cnt < H_SYNC_CYC )& h( t0 {6 i+ F5 T9 J0 J" w
oVGA_H_SYNC <= 0;
. w" c! f4 F/ L6 ]& L% t else1 N% h! D0 _1 o5 K3 |" m4 \
oVGA_H_SYNC <= 1;
$ ]( I. s* Y1 r c/ F& j8 p* F end
+ k& K" U$ F, o( @4 r/ Oend' x2 R3 H$ k1 b+ @% x ?/ Y( D3 h
+ V% f( Z( X8 z9 m
always @(posedge clk)
- j0 V8 q0 P, W$ ybegin1 Z5 _8 R8 B; {% j
if (rst) begin
1 r4 m7 @* p' a6 T e1 T1 S v_cnt <= 12'd0;
/ R# P* G1 c, }4 C; q. c" w+ V* a oVGA_V_SYNC <= 1'b0;
/ V( f; W( ^/ M7 R end
0 |) z6 ^8 m% v/ r" a' R else. \5 Q5 U0 C$ J! d; r$ o
if (h_cnt == 0 )
! n" F$ D8 s M2 u; R8 \# e begin& T, ~7 X1 q0 A, U: T
// V_Sync Counter
b7 I, Z! y. |4 ], j1 F* D2 |) W if (v_cnt < (V_SYNC_TOTAL-1))
$ B2 V. n8 F [( b, { J v_cnt <= v_cnt + 12'd1;
6 |% h8 Q; u5 f) J$ x4 P8 c else/ t! b6 k9 j" U
v_cnt <= 12'd0;
' Y0 |+ ~( K. w. D- K // V_Sync Generator
: ~, Q% V8 t1 N" q if (v_cnt < V_SYNC_CYC)9 K0 ?" z0 k8 K* [
oVGA_V_SYNC <= 1'b0;
/ c4 h7 b8 G* }4 [$ B else
) e7 f/ l P0 r1 p oVGA_V_SYNC <= 1'b1;; b7 Y# o0 i4 u
end" Z; k/ x9 z. d# h0 \5 S
end5 W' F4 Z" y& B D+ T+ C# B
5 p# [8 }$ B8 a o" A- N8 p7 v! ~, c: I4 L4 k/ {
endmodule |
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