GS9062-CFE3 datasheet(31/46 Pages) GENNUM

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GS9062 Data Sheet

22209 - 7

February 2007

31 of 46

3.6.3.3 EDH Generation and Insertion

The GS9062 will generate and insert complete EDH packets into the data stream.

Packet generation and insertion will only take place if the EDH_CRC_INS bit of the

IOPROC_DISABLE register is set LOW.

The GS9062 will generate all of the required EDH packet data including all ancillary

data preambles, (DID, DBN, 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.

SMPTE RP165 specifies the calculation ranges and scope of EDH data for

standard 525 and 625 component digital interfaces. The GS9062 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 ID words or supplied H, V, and F timing

signals Internal Flywheel on page 23.

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 3-8 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.

EDH error flags (EDH, EDA, IDH, IDA and UES) for ancillary data, full field and

active picture will also be inserted. These flags must be programmed into the

EDH_FLAG registers of the device by the application layer (Table 3-9).

NOTE 1: It is the responsibility of the user to ensure that the EDH flag registers are

updated once per field.

The prepared EDH packet will be inserted at the appropriate line of the video

stream according to RP165. The start pixel position of the inserted packet will be

based on the SAV position of that line such that the last byte of the EDH packet

(the checksum) will be placed in the sample immediately preceding the start of the

SAV TRS word.

NOTE 2: It is also the responsibility of the user to ensure that there is sufficient

space in the horizontal blanking interval for the EDH packet to be inserted.

GS9062-CFE3 Datasheet(PDF) 31 Page - Gennum Corporation

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