GS2970A datasheet(76/150 Pages) SEMTECH

Part #	GS2970A

Description	3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing

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Manufacturer	SEMTECH [Semtech Corporation]

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76 / 150 page

GS2970A 3Gb/s, HD, SD SDI Receiver

Data Sheet

54244 - 2

September 2012

76 of 150

programmed (with the other set to zero), ancillary data packets are extracted from one

line per frame only. When both registers are set to zero, the device extracts packets from

all lines.

To start Ancillary Data Extraction, the ANC_DATA_EXT_MASK bit of the host interface

must be set LOW. Ancillary data packet extraction begins in the following frame (see

Figure 4-31: Ancillary Data Extraction - Step A).

Figure 4-31:Ancillary Data Extraction - Step A

Ancillary data is written into Bank A until full. The Y/1ANC and C/2ANC output flags

can be used to determine the length of the ancillary data extracted and when to begin

reading the extracted data from memory.

While the ANC_DATA_EXT_MASK bit is set LOW, the ANC_DATA_SWITCH bit can be

set HIGH during or after reading the extracted data. New data is then written into Bank

B (up to 1024 x 16-bit words), at the corresponding host interface addresses (see Figure

4-32: Ancillary Data Extraction - Step B).

ANCDATA

0

1023

Application Layer

Read Pointer

Internal Write

Pointer

Bank A

ANC_DATA_SWITCH=LOW

0

1023

Bank B

800h

BFFh

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