參數資料
型號: BT849A
英文描述: Single-Chip Video Capture for PCI
中文描述: 單芯片的PCI視頻捕捉
文件頁數: 134/141頁
文件大?。?/td> 1149K
代理商: BT849A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Brooktree
124
C
ONTROL
R
EGISTER
D
IGITAL
V
IDEO
I
N
S
UPPORT
(B
T
848A/849A O
NLY
)
HDELAY/HSCALE
L848A_A
HDELAY/HSCALE
HDELAY = 128 * (#DesiredPixels/#Hactive Pixels)
HSCALE = 4096 * (#HactivePixels/#DesiredPixels –1)
This is the alternate usage for the HDELAY and HSCALE registers when using the Bt848A/849A.
The HSCALE function has not changed, but there are more #HactivePixels standard input formats to consid-
er.Since overscan, underscan, or normal scan is a subjective requirement, the formula for horizontal scaling may need
to be adjusted for each video input format or standard being implemented.
HDELAY should be set to 128 (0x80) for most pixel formats when unscaled. However, HDELAY may need to be
empirically determined for video input formats where the normal 0x80 and scaled derivatives do not correctly com-
pensate for horizontal misalignment.
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