GS2962 datasheet(55/82 Pages) SEMTECH

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GS2962 3G/HD/SD-SDI Serializer with Complete

SMPTE Video Support

Data Sheet

48005 - 7

October 2010

55 of 82

Insertion of SMPTE 352M packets into each data stream is controlled by the status

format describing bit, SDTI_TDM_DS1 and SDTI_TDM_DS2 for Data Stream One and

Data Stream Two. If SDTI_TDM_DS1 (default LOW) is set HIGH by the user, the GS2962

does not insert SMPTE 352M packets into Data Stream One. Similarly, SMPTE 352M

packets are inserted in Data Stream Two only if SDTI_TDM_DS2 is set LOW. This allows

the user to individually disable SMPTE 352M packets where the data stream is carrying

an HD-SDTI or TDM signal, which must not have SMPTE 352M packets embedded.

NOTE: The user must ensure that there is sufficient space in the horizontal blanking

interval for the insertion of the SMPTE 352M packets. If the FIRST_AVAIL_POSITION bit

in the host interface registers is set HIGH (by default), the SMPTE 352M packets are

inserted in the first available position following any existing ancillary data. If the

FIRST_AVAIL_POSITION CSR bit is set LOW, then the packets are inserted immediately

after the EAV/CRC1.

If there are pre-existing 352M packets, they will be overwritten if the

FIRST_AVAIL_POSITION CSR bit is HIGH. If the FIRST_AVAIL_POSITION CSR bit is

LOW, the pre-existing 352M packet will be overwritten only if it is contiguous to the

EAV/CRC1 sequence.

4.8.9 Line Based CRC Generation and Insertion (HD/3G)

When operating in HD mode (RATE_SEL0 pin = LOW, RATE_SEL1 pin = LOW), the

GS2962 generates and inserts line based CRC words into both the Y and C channels of

the data stream.

When operating in 3G (RATE_SEL0 pin = LOW, RATE_SEL1 pin = HIGH) Level A mode,

the GS2962 generates and inserts line based CRC words into both Data Stream One and

Data Stream Two.

When operating in 3G (RATE_SEL0 pin = LOW, RATE_SEL1 pin = HIGH) Level B mode,

the GS2962 generates and inserts line based CRC words into both Y and C channels of

both Link A and Link B.

The line based CRC insertion only takes place if the IOPROC_EN/DIS pin is HIGH and

SMPTE_BYPASS is HIGH.

In addition to this, the GS2962 requires the CRC_INS bit to be set LOW in the IOPROC

4.8.10 EDH Generation and Insertion

When operating in SD mode, the GS2962 generates and inserts EDH packets into the

data stream.

The EDH packet generation and insertion only takes place if the IOPROC_EN/DIS pin is

HIGH, SMPTE_BYPASS pin is HIGH, the RATE_SEL0 pin is HIGH and the EDH_CRC_INS

bit is set LOW in the IOPROC register.

Calculation of both Full Field (FF) and Active Picture (AP) CRCs is carried out by the

device.

GS2962 Datasheet(PDF) 55 Page - Semtech Corporation

GS2962 Datasheet(HTML) 55 Page - Semtech Corporation

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