4.10.6.3 Ancillary Data Checksum Error Correction
When ancillary Data Checksum Error Correction and Insertion is enabled, the GS1559
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
(Programmable Ancillary Data Detection on page 42), 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.
4.10.6.4 Line Based CRC Correction
The GS1559 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.
4.10.6.5 HD Line Number Error Correction
In HD mode, the GS1559 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 44).
This feature is enabled when SD/HD = LOW, and the LNUM_INS bit of the
IOPROC_DISABLE register is set LOW.
4.10.6.6 TRS Error Correction
When TRS error correction and insertion is enabled, the GS1559 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.
4.10.7 EDH Flag Detection
As described in EDH CRC Error Detection on page 50, the GS1559 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 4-15).
One set of flags is provided for both fields 1 and 2. Field 1 flag data will be overwritten
by field 2 flag data.
The EDH_FLAG register may be read by the Host Interface at any time during the
received frame except on the lines defined in SMPTE RP165 where these flags are
updated.
GS1559 HD-LINX™ II Multi-Rate Deserializer with
Loop-Through Cable Driver
Data Sheet
55 of 71
30572 - 8
July 2008
GENNUM [ GENNUM CORPORATION ]
