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): 102/141頁
文件大?。?/td> 1149K
代理商: BT849A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Brooktree
92
C
ONTROL
R
EGISTER
D
EFINITIONS
Input Format Register
L848A_A
Input Format Register
Memory Mapped Location 0x004 – (IFORM)
Upon reset it is initialized to 0x58. FORMAT(0) is the least significant bit.
Bits
Type
Default
Name
Description
[7]
RW
0
Reserved
This bit must be set to zero.
[6:5]
RW
10
MUXSEL
Used for software control of video input selection. The Bt848 can
select between three composite video sources, or two composite
and one S-video source.
00
= Reserved
01
= Select MUX2 input to MUXOUT
10
= Select MUX0 input to MUXOUT
11
= Select MUX1 input to MUXOUT
MUXSEL
00
= Select MUX3 input to MUXOUT
[4:3]
RW
11
XTSEL
If automatic format detection is required, logical 11 must be
loaded. Logical 01 and 10 are used if software format selection is
desired.
00
= Reserved
01
= Select XT0 input (only XT0 present)
10
= Select XT1 input (both XTs present)
11
= Auto XT select enabled (both XTs present)
[2:0]
RW
000
FORMAT
Automatic format detection may be enabled or disabled. The
NUML bit is used to determine the input format when automatic
format detection is enabled.
000 = Auto format detect enabled
001 = NTSC (M) input format
010 = NTSC w/o pedestal (Japan)
011 = PAL (B, D, G, H, I) input format
100 = PAL (M) input format
101 = PAL (N) input format
110 = SECAM input format
111 = Reserved
FORMAT
111 = PAL (N-combination) input format
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