BT848 ETC, BT848 Datasheet - Page 105
BT848
Manufacturer Part Number
BT848
Description
Single-Chip Video Capture for PCI
Manufacturer
ETC
Datasheet
1.BT848.pdf
(141 pages)
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Bt848/848A/849A
Single-Chip Video Capture for PCI
Horizontal Active Register, Lower Byte
Memory Mapped Location 0x01C – Even Field (E_HACTIVE_LO)
Memory Mapped Location 0x09C – Odd Field (O_HACTIVE_LO)
Upon reset it is initialized to 0x80. HACTIVE_LO(0) is the least significant bit. HACTIVE defines the number of hor-
izontal active pixels per line output by the Bt848. This 8-bit register is the lower byte of the 10-bit HACTIVE register.
The two MSBs of HACTIVE are contained in the CROP register.
Horizontal Scaling Register, Upper Byte
Memory Mapped Location 0x020 – Even Field (E_HSCALE_HI)
Memory Mapped Location 0x0A0 – Odd Field (O_HSCALE_HI)
Upon reset it is initialized to 0x02. This 8-bit register is the upper byte of the 16-bit HSCALE register.
Horizontal Scaling Register, Lower Byte
Memory Mapped Location 0x024 – Even Field (E_HSCALE_LO)
Memory Mapped Location 0x0A4 – Odd Field (O_HSCALE_LO)
Upon reset it is initialized to 0xAC. This 8-bit register is the lower byte of the 16-bit HSCALE register.
Brooktree
Bits
Bits
Bits
[7:0]
[7:0]
[7:0]
Type
Type
Type
®
RW
RW
RW
Default
0x80
Default
0x02
Default
0xAC
Name
HACTIVE_LO
Name
HSCALE_HI
Name
HSCALE_LO
L848A_A
Description
The least significant byte of the horizontal active register.
Description
The most significant byte of the horizontal scaling ratio.
Description
The least significant byte of the horizontal scaling ratio.
Horizontal Active Register, Lower Byte
C
ONTROL
R
EGISTER
D
EFINITIONS
95
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