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發表於 2009-6-11 12:43:50
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ODDR2 #(+ F* A8 d5 K) r2 K4 M
.DDR_ALIGNMENT("NONE"), // Sets output alignment to "NONE", "C0" or "C1" 1 A; z/ w! a6 f# K% ~
.INIT(1'b0), // Sets initial state of the Q output to 1'b0 or 1'b1
/ c4 f7 _* W- q5 C0 t) F .SRTYPE("SYNC") // Specifies "SYNC" or "ASYNC" set/reset/ g- B( i0 ~. R
) ODDR2_inst (
$ s4 s! g- T* V9 ~9 V% z .Q(oVGA_CLOCK), // 1-bit DDR output data
8 \) E. q( f/ o! v" u .C0(clk), // 1-bit clock input7 \- y* F5 E' q a
.C1(~clk), // 1-bit clock input
" ]0 U# S: ^" r, h `' Z3 @& O; S .CE(1'b1), // 1-bit clock enable input
* B& g2 P- W/ D& @+ c o .D0(1'b0), // 1-bit data input (associated with C0)
7 c; d5 r' e7 O+ ~' q2 x; S .D1(1'b1), // 1-bit data input (associated with C1)3 y) [& E* I; b* a+ K/ O
.R(1'b0), // 1-bit reset input9 S1 C D; F4 h- ]
.S(1'b0) // 1-bit set input
; ?- ~2 b# M, ~) x# S" @6 H );, q% Z& p( U# U
7 Y& t$ f9 e3 D7 N7 Q. y
always @(posedge clk), e! f8 A8 ^6 K% Z! d& l5 j
begin; G! T; U2 T: [/ U+ P9 z4 o9 x
oVGA_SYNC <= oRequest;
! s$ |" K& l1 a0 Rend
) X1 Z7 A) e4 e) _: Z3 \" E% T) Q6 i/ ~$ U; w, f) c& ^7 X6 D
always @(posedge clk)
) A, ^- F: S, n, W7 T4 Hbegin
" Z) {- w( @/ Q2 M# K: X if (rst)
6 k# V: K0 {8 a. q oRequest <= 1'b0;+ c* B8 [ T* t; V
else begin2 O2 m( g& d, G! |; X' 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))
8 W6 A K6 S+ W) p9 a+ N' g oRequest <= 1'b1;* `6 _2 h" w* x3 u
else5 H4 c6 [2 R2 }( C: \4 F5 g
oRequest <= 1'b0;- o( I( l$ D& O; H) A# X8 f
end
7 @& k, O% l/ Zend8 P9 m8 r, y- ]" p# `
* C, s4 _; Q, f2 I! F5 z7 _, i
// H_Sync Generator, Ref. 25.175 MHz Clock
; K- Y- K5 {+ k7 ^! balways @(posedge clk)
* }7 V5 [7 \) \9 ~% j! @- Fbegin9 Q1 Q G1 _/ r, C! a
if (rst) begin
, J* [4 u$ [8 k. W: ] h_cnt <= 12'd0;# v. p9 ^+ u! X' F5 K
oVGA_H_SYNC <= 1'b0;
/ R: }& K: D, }! c% N( r end* l) V6 z5 j6 l6 c
else begin
H! P ]0 p% F/ N$ p // H_Sync Counter# @! a; D$ l4 d( c9 C5 V" ]
if (h_cnt < (H_SYNC_TOTAL-1) )
( ]6 r O0 t2 x& A5 |' ~ h_cnt <= h_cnt + 12'd1;
* z- P0 G5 x1 `7 a+ e; ] else
% {6 W( o. F0 Y3 H9 q: V; ]0 w h_cnt <= 12'd0;
7 p4 K" H) j' c* f( b ; N8 |6 O! Q2 @& {, `
// H_Sync Generator
& l$ G: E# o2 K" T8 X' I1 x' D if( h_cnt < H_SYNC_CYC )
4 `: z. ~: V% y7 P$ O oVGA_H_SYNC <= 0;7 I9 T+ \. a1 f& m; N; d1 q
else5 Y8 j, h/ G1 a& C6 ?, E4 _# ]
oVGA_H_SYNC <= 1;, U& V1 K0 z* K
end" ], N$ Q. R" y
end& g' k( ]% ^& R6 R: s9 e, v$ J
& {* s) p6 }- V, V: |: Yalways @(posedge clk)
% E, E% l/ J7 N: ybegin
' \$ i( |% {2 U7 K. P if (rst) begin, {) B8 C2 b# \. I$ Q; X% `
v_cnt <= 12'd0;7 {1 g& R1 B! ?; O3 C! c7 W+ L3 W
oVGA_V_SYNC <= 1'b0;& z0 {' X5 W5 |% r6 f! O
end9 e6 d+ Z, }4 F. w4 g: H
else8 _- D7 W& k. ~% E1 g/ g% T0 {
if (h_cnt == 0 )/ L7 m/ Z1 m( U/ N
begin
8 o5 ?' a& h2 q9 `, m // V_Sync Counter1 A9 ]! j4 k8 p# O) f; M8 x( F
if (v_cnt < (V_SYNC_TOTAL-1))
. b( g/ [% x$ H9 |* n% n v_cnt <= v_cnt + 12'd1;- U8 ~7 |, s. I2 N! [4 Q
else3 `# m$ g1 N ~) A. A% z0 i
v_cnt <= 12'd0;
. M) _8 p( y, O) M2 ~) D. h // V_Sync Generator
' c( j+ N: [4 ?; k T if (v_cnt < V_SYNC_CYC)" F9 I7 N" B2 z
oVGA_V_SYNC <= 1'b0;
7 f: v: U2 U% R3 J0 x else! G: @6 A. _3 Q
oVGA_V_SYNC <= 1'b1;
0 J: f7 E0 V) e5 P/ \& e- d end
6 U6 E+ _) C0 lend
, ~& N% `4 q X) `/ F/ S0 n3 {+ Y9 Y0 p6 g6 ^' ]: g7 j
4 D8 B& D, r- l" Z5 Yendmodule |
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