GS9092ACNE3 datasheet(42/63 Pages) GENNUM

42 / 63 page

GS9092A GenLINX® III 270Mb/s Serializer for SDI and

DVB-ASI

Data Sheet

34715 - 4

May 2010

42 of 63

DC), reserved code words and checksum. Calculation of both full field (FF) and active

picture (AP) CRC's will be carried out by the device.

By default, after a system reset, the GS9092A will calculate the EDH ranges based on the

setting of the DETECT_TRS pin. If DETECT_TRS is LOW, the device will calculate the

EDH ranges based on the received H, V, and F timing. If DETECT_TRS is HIGH, the device

will calculate the ranges based on the internal TRS timing.

Alternatively, the user can program the EDH calculation ranges in the host interface.

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 3-7

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 AP pixel will always be

the first pixel after the SAV TRS code words. The first FF pixel will always be the first

pixel after the EAV TRS code words. The last AP pixel and last FF pixel will always be the

last pixel before the start of the EAV code words. Figure 3-9 shows the positions of the

FF and AP pixel positions relative to TRS words and H timing.

Figure 3-9: First and Last FF and AP Pixel Positions

H Timing (H_CONFIG = LOW)

3FF

000

XYZ

SAV

XYZ

EAV

LAST

FF &

PIXEL

FIRST

PIXEL

FIRST

PIXEL

FIRST

PIXEL

FIRST

PIXEL

LAST

FF &

PIXEL

H Timing (H_CONFIG = HIGH)

GS9092ACNE3 Datasheet(PDF) 42 Page - Gennum Corporation

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