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): 115/141頁
文件大小: 1149K
代理商: BT849A
Brooktree
105
C
ONTROL
R
EGISTER
D
EFINITIONS
Test Control Register
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
Test Control Register
Memory Mapped Location 0x054 – (TEST)
This control register is reserved for putting the part into test mode. Write operation to this register may cause unde-
termined behavior and should not be attempted. A read cycle from this register returns 0x01, and only a write of 0x01
is permitted.
AGC Delay Register
Memory Mapped Location 0x060 – (ADELAY)
Upon reset, it is initialized to 0x68.
Burst Delay Register
Memory Mapped Location 0x064 – (BDELAY)
Upon reset, it is initialized to 0x5D. BDELAY(0) is the least significant bit.
Bits
Type
Default
Name
Description
[7:0]
RW
0x68
ADELAY
AGC gate delay for back-porch sampling. The following equation
should be used to determine the value for this register:
ADELAY = ( 6.8
μ
S * 4*Fsc) + 7
Example for an NTSC input signal:
ADELAY = (6.8
μ
S x 14.32 MHz) + 7
= 104 (0x68)
Bits
Type
Default
Name
Description
[7:0]
RW
0x5D
BDELAY
The burst gate delay for sub-carrier sampling. The following equa-
tion should be used to determine the value for this register:
BDELAY = ( 6.5
μ
S * 4*Fsc)
Example for an NTSC input signal:
BDELAY = (6.5
μ
S x 14.32 MHz)
= 93 (0x5D)
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