GS9060 Data Sheet
3.10.5.1 Video Standard Error Detection
If a mismatch between the received SMPTE 352M packets and the calculated
video standard occurs, the GS9060 will indicate a video standard error by setting
the VD_STD_ERR bit of the ERROR_STATUS register HIGH.
3.10.5.2 EDH CRC Error Detection
The GS9060 calculates Full Field (FF) and Active Picture (AP) CRC words
according to SMPTE RP165 in support of Error Detection and Handling packets in
SD signals.
These calculated CRC values are compared with the received CRC values. If a
mismatch is detected, the error is flagged in the AP_CRC_ERR and/or
FF_CRC_ERR bits of the ERROR_STATUS register. These two flags are shared
between fields 1 and 2.
The AP_CRC_ERR bit will be set HIGH when an active picture CRC mismatch has
been detected in field 1 or 2. The FF_CRC_ERR bit will be set HIGH when a full
field CRC mismatch has been detected in field 1 or 2.
EDH CRC errors will only be indicated when the device is operating in SMPTE
mode, and when the device has correctly received EDH packets.
SMPTE RP165 specifies the calculation ranges and scope of EDH data for
standard 525 and 625 component digital interfaces. The GS9060 will utilize these
standard ranges by default.
If the received video format does not correspond to 525 or 625 digital component
video standards as determined by the flywheel pixel and line counters, then one of
two schemes for determining the EDH calculation ranges will be employed:
1. Ranges will be based on the line and pixel ranges programmed by the host
interface; or
2. In the absence of user-programmed calculation ranges, ranges will be
determined from the received TRS timing information.
The registers available to the host interface for programming EDH calculation
ranges include active picture and full field line start and end positions for both
fields. Table 3-12 shows the relevant registers, which default to '0' after device
reset.
If any or all of these register values are zero, then the EDH CRC calculation ranges
will be determined from the flywheel generated H signal. The first active and full
field pixel will always be the first pixel after the SAV TRS code word. The last active
and full field pixel will always be the last pixel before the start of the EAV TRS code
words.
22208 - 8 January 2007
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