cx25840 Conexant Systems, Inc., cx25840 Datasheet - Page 216

• Manufacturer Part Number: cx25840
• Description: Video Decoder And Broadcast Audio
• Manufacturer: Conexant Systems, Inc.

Register Map
5-74
VBI Hamming
[7:4]
[3:0]
Closed Caption Status
[7:0]
Closed Caption Data
[7:0]
GEMSTAR 1x Status
[7:0]
Bits
Bits
Bits
Bits
RZ
RW
RO
RO,PR
RO
Type
Type
Type
Type
0000
0000
0x00
0x00
0x00
Default
Default
Default
Default
RESERVED
HAMMING_TYPE
CC_STAT
CC_FIFO_DAT
GS1_STAT
Name
Name
Name
Name
Conexant
See description of CC_STAT byte.
When this field matches the VBIMODE setting for a
particular line, hamming comparison is enabled for that
type. Leave this field at 0x0 to disable the feature. When
enabled, the least-significant four bits of the framing code
are used for hamming comparison.
Generic payload status format:
Bit 7 – PARERR
Bit 6 – FF
Bit 5 – DA
Bit 4 – CX/XDS
Bits 3–2 – RESERVED
Bits 1–0 – BYTE_NUM
CC/XDS payload data. Data pointer advanced after reading
this byte.
0 – No parity error detected
1 – Parity error detected
0 – FIFO not full
1 – FIFO full
0 – FIFO is empty
1 – One or more bytes available for read
0 – CC byte (odd field)
1 – XDS byte (even field)
BYTE_NUM describes byte number within a field. For
payloads larger than four, the number will wrap.
00 – Byte 1
01 – Byte 2
02 – Byte 3
03 – Byte 4
Description
Description
Description
Description
CX25840/1/2/3 Data Sheet
Address 0x446
Address 0x443
Address 0x444
Address 0x445
102284B
8/3/05