參數(shù)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(shù): 47/141頁
文件大?。?/td> 1149K
代理商: BT849A
Brooktree
37
F
UNCTIONAL
D
ESCRIPTION
VBI Data Output Interface
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
In the VBI frame output mode, the VBI data capture occurs in the active video
region and includes all the horizontal blank/sync information in the data stream.
The data is vertically bound beginning at the first line during VACTIVE and ending
after a fixed number of packets. The data stream is packetized into a series of
256-DWORD blocks.
A fixed number of DWORD blocks (434 for NTSC and 650 for PAL) are cap-
tured during each field. This is equivalent to 111,104 DWORDs for NTSC (434 *
256 DWORDS) and 166,400 DWORDs for PAL (650 * 256 DWORDs) per field.
The VBI frame capture region may be extended to include the 10 lines prior to the
default VACTIVE region by setting the EXT_FRAME register bit. VDELAY must
also be set to its minimum value of 2. The extended DWORD block size is 450
DWORD blocks for NTSC and 674 DWORD blocks for PAL.
The VBI frame data capture occurs during the even field when the
CAPTURE_EVEN register bit is set and the COLOR_EVEN bit is set to raw
mode, and during the odd field when the CAPTURE_ODD register bit is set and
the COLOR_ODD bit is set to raw mode. The captured data stream is continuous
and not aligned with HSYNC.
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