BT848 ETC, BT848 Datasheet - Page 121

• Manufacturer Part Number: BT848
• Description: Single-Chip Video Capture for PCI
• Manufacturer: ETC

Bt848/848A/849A
Single-Chip Video Capture for PCI
PLL Reference Multiplier - PLL_F_LO (Bt848A/849A only)
Memory Mapped Location - 0x0F0
Upon reset it is initialized to 00
PLL Reference Multiplier - PLL_F_HI (Bt848A/849A only)
Memory Mapped Location - 0x0F4
Upon reset it is initialized to 00
Integer- PLL-XCI (Bt848A/849A only)
Memory Mapped Location - 0x0F8
Upon reset it is initialized to 00
Field Capture Counter-(FCAP) (Bt848A/849A only)
Memory Mapped Location - 0x0E8
Upon reset it is initialized to 00
Brooktree
Bits
Bits
Bits
Bits
Notes: (1). Any write to this register resets the contents to zero.
[7:0]
[7:0]
[5:0]
[7:0]
[6]
[7]
Type
Type
Type
Type
®
RW
RW
RW
RW
RW
RW
(1)
Default
0x00
Default
0x00
Default
000000
0
0
Default
0x00
Name
PLL_F_LO
Name
PLL_F_HI
Name
PLL_I
PLL_C
PLL_X
Name
FCNTR
L848A_A
Description
Lower byte of PLL Frequency register.
Description
Upper byte of PLL Frequency register
Description
PLL_I input. Range 6–63. If set to 0x00, then the PLL sleeps.
PLL VCO post-divider
PLL Ref xtal pre-divider
Description
Counts Field transitions when any CAPTURE bit is set.
0
1
0
1
= Use 6 for post-divider
= Use 4 for post-divider
= Use 1 for pre-divider
= Use 2 for pre-divider
PLL Reference Multiplier - PLL_F_LO (Bt848A/849A only)
C
ONTROL
R
EGISTER
D
EFINITIONS
111