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參數資料
| 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： | 10/33頁 |
| 文件大?。?/td> | 595K |
| 代理商： | AL251 |
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AL250
July 28, 1999
10
The H-sync Start and End (registers 22h and 23h) define the output horizontal sync period relative to
the input H-sync leading edge.
The Horizontal Blank Start and End (registers 2Bh and 2Ch) define the output H-sync blanking
period.
The Horizontal Capture Start and End (registers 20h and 21h) define the active pixels in each line
relative to the input video H-sync. These registers can also be used for adjusting the position of the
output picture.
The Horizontal Total High and Low (registers 24h and 29h) define the total number of pixels per line.
The AL250/251 can detect the H-total automatically when the input data is of the typical resolution
mentioned in the Default Resolution section.
The V-sync Start and End (registers 27h and 28h) define the output V-sync period relative to the input
V-sync start.
The Vertical Blank Start and End (registers 2Dh and 2Eh) define the output V-sync blanking period.
The Vertical Capture Start and End (registers 25h and 26h) define the active lines.
The total number of lines per frame (Vertical Total) is detected by the AL250/251 automatically.
To take advantage of the auto detection of the AL250/251, set the bit 3 of the Control register #08h
(Softtime) as 0. If a user-defined input format is used, then disable the hardware default by setting
this bit as 1, and write all of the parameters to the corresponding registers to define the format. The
sample code the AL250EVB provides disables the hardware settings.
The following typical parameters (as well as hardware default values) are for reference:
Mode
Square NTSC
Square PAL
CCIR NTSC
CCIR PAL
H(Horizontal) total
780
944
858
864
V(Vertical) total
525
625
525
625
HDE Start
120
160
72
80
HDE End
736
896
752
760
H-sync Start
776
0
792
808
H-sync End
56
72
856
16
VDE Start
48
60
48
60
VDE End
500
604
500
604
V-sync Start
4
4
4
4
V-sync End
8
8
8
8
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