GS1560A/GS1561 Data Sheet
3.10.6.3 Ancillary Data Checksum Error Correction
When ancillary data checksum error correction and insertion is enabled, the
GS1560A/GS1561 will generate and insert ancillary data checksums for all
ancillary data words by default. Where user specified ancillary data has been
programmed into the device, (see Programmable Ancillary Data Detection on
page 50), only the checksums for the programmed ancillary data types will be
corrected.
This feature is enabled when the ANC_CSUM_INS bit of the IOPROC_DISABLE
register is set LOW.
3.10.6.4 Line Based CRC Correction
The GS1560A/GS1561 will generate and insert line based CRC words into both the
Y and C channels of the data stream. This feature is only available in HD mode and
is enabled by setting the CRC_INS bit of the IOPROC_DISABLE register LOW.
3.10.6.5 HD Line Number Error Correction
In HD mode, the GS1560A/GS1561 will calculate and insert line numbers into the
Y and C channels of the output data stream.
Line number generation is in accordance with the relevant HD video standard as
determined by the device, (see Automatic Video Standard and Data Format
Detection on page 52).
This feature is enabled when SD/HD = LOW, and the LNUM_INS bit of the
IOPROC_DISABLE register is set LOW.
3.10.6.6 TRS Error Correction
When TRS error correction and insertion is enabled, the GS1560A/GS1561 will
generate and insert 10-bit TRS code words as required.
TRS word generation will be performed in accordance with the timing parameters
generated by the flywheel to provide an element of noise immunity. As a result,
TRS correction will only take place if the flywheel is enabled, (FW_EN/DIS =
HIGH).
In addition, the TRS_INS bit of the IOPROC_DISABLE register must be set LOW.
3.10.7 EDH Flag Detection
As described in EDH CRC Error Detection on page 58, the GS1560A/GS1561 can
detect EDH packets in the received data stream. The EDH flags for ancillary data,
active picture and full field areas are extracted from the detected EDH packets and
placed in the EDH_FLAG register of the device (Table 3-15).
One set of flags is provided for both fields 1 and 2. Field 1 flag data will be
overwritten by field 2 flag data.
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