cx25840 Conexant Systems, Inc., cx25840 Datasheet - Page 226

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

Register Map
5-84
VBI Custom 3 Miscellaneous
[7]
[6:4]
[3:0]
Bits
RW
RW
RW
Type
0
000
0x2
Default
VBI3_HAM_EN
VBI3_FIFO_MODE
VBI3_FORMAT_TYPE
Name
Conexant
Enable hamming comparison for framing comparison when
this bit is set. When set VBI3_FRAME_CODE[3:0] are used for
hamming comparison.
Determines which payload FIFO is loaded.
000 = Do not load to payload FIFO
001 = Load to Gemstar 1x FIFO
010 = Load to CC FIFO
011 = Load to WSS FIFO
100 = Load to Gemstar 2x FIFO
Specifies basic VBI decoding model. Find the standard format
which most closely matches the intended format, and program
this field to match the type field encoding specified in the
VBI_LINE_CTRLx registers. Special operating modes are
enabled based on the format type as described below:
0000 = RESERVED
0101, 1010, 0011 = Teletext: Enable packet address filter
0011 = Enable Moji style byte alignment: First 6 bits go into
separate byte packet. 525-line modes only.
0100 = Wide-screen signaling: Assume signal includes single
sync pulse, and no frame code. 525-line mode only.
0100 = Wide-screen signaling: Implement WSS625 style
biphase decoding. 625-line mode only.
0101 = VITC: Assume sync pulses every 8 bits
0110, 0111, 1000 = Closed caption: Assume 50 IRE signal
amplitude
1001 = VPS: Implement VPS-style biphase decoding
Description
CX25840/1/2/3 Data Sheet
Address 0x46F
102284B
8/3/05