Vitc; Figure 112: Ccap Waveform And Decoded Data Correlation - Analog Devices Advantiv ADV7604 Hardware Manual

VDP_CCAP_DATA_2 VDP Closed Caption Readback 2, VDP Map, Address 0x42, [7:0], Read
only
Function
VDP_CCAP_DATA_2
xxxx xxxx
0x42[7:0]

Figure 112: CCAP Waveform and Decoded Data Correlation

11.11.4 VITC

VITC has a synchronization sequence of 10 between each data byte. The VDP strips these
synchronizations from the data stream to output only the data bytes. The VITC results are available
in the VDP_VITC_DATA_0 to VDP_VITC_DATA_8 registers.
The VITC has a CRC byte at the end and the synchronizations are also used in this CRC calculation.
Since the synchronizations are not output, the CRC is also calculated internally and the calculated
CRC is also available for the user in the VITC_CALC_CRC register. Once the VDP completes
decoding the VITC line, the VITC_DATA and VITC_CALC_CRC registers are updated and the
VITC_AVL flag is set.
CRC_ENABLE , CP Map, Address 0xF2, [2], R/W
Function
CRC_EN
0
1
STATUS_CLEAR_VITC , VDP Map, Address 0x78, [6], Write only
Function
STATUS_CLEAR_VITC
0
Rev. F August 2010
Description
Decoded byte 1 of CCAP data[15:8]
VDP_CCAP_DATA[15:8]
Description
CRC disabled
CRC enabled
Description
Not necessary to write 0 since STATUS_CLEAR_VITC is a self
clearing bit
346
ADV7604