參數(shù)資料
型號： AL251
廠商： Electronic Theatre Controls, Inc.
英文描述： Video Scan Doubler
中文描述： 視頻掃描倍增器
文件頁數(shù)： 9/33頁
文件大?。?/td> 595K
代理商： AL251
AL250
July 28, 1999
9
DO
4
DO
3
DO
2
DO
1
DO
0
DO
15
DO
14
DO
13
DO
12
DO
11
DO
10
DO
9
DO
8
51
50
49
48
47
66
65
64
63
26
25
24
23
-
Y4
Y3
Y2
Y1
Y0
R4
R3
G7
G6
G5
G4
G3
G2
B7
B6
B5
B4
B3
0
U7, V7
U6, V6
U5, V5
U4, V4
U3, V3
U2, V2
U1, V1
U0, V0
1
OutFormat
select
To select YUV422 or RGB565 as the output format, program the Control Register #08h<7>, i.e.,
OutFormat.
6.2 Default Resolution
The resolution of the AL250/251 applications depends on the input video source, e.g., the digital
video decoder. The typical resolution of the video decoder that the AL250/251 supports without
software, and the VCLK frequency provided by the decoder to the AL250/251 is as follows:
Square Pixel
CCIR 601
NTSC
PAL
NTSC
PAL
Pixel Total
780 x 525
944 x 625
858 x 525
864 x 625
Pixel Active
640 x 480
768 x 576
720 x 480
720 x 576
VCLKx2 (MHz)
24.545454
29.5
27
27
VCLK (MHz)
12.272727
14.75
13.5
13.5
The AL250/251 can process up to 768 active pixels per line and 1024 lines per frame.
6.3 Video Timing
The AL250/251 registers 20h~29h and 2Bh~2Eh are used to control the video timing. All increments
are either by 8 pixels per line or by 4 lines per frame. All values (times 8 or 4) are relative to the
input video source H-sync or V-sync. These registers need to be programmed if the input video
resolution is different from the default resolution supported.
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