GS3471 datasheet(76/179 Pages) SEMTECH

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GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

76 of 179

Semtech

www.semtech.com

To extract packets from the Chroma/Data Stream 2 channel only, the HD_ANC_C2 bit

of the host interface must be set HIGH. To extract packets from both Luma/Data Stream

1 and Chroma/Data Stream 2 video data, the HD_ANC_Y1_C2 bit must be set HIGH (the

setting of the HD_ANC_C2 bit is ignored).

The default setting of both the HD_ANC_C2 and HD_ANC_Y1_C2 is LOW. The setting

of these bits is ignored when the device is configured for SD video standards.

After extraction, the ancillary data may be deleted from the video stream by setting the

ANC_DATA_DEL bit of the host interface HIGH. When set HIGH, all existing ancillary

data is removed and replaced with blanking values. If any of the

ANC_TYPE_[5:1]_DS[2:1] registers are programmed with a DID and/or DID and SDID,

only the ancillary data packets with the matching IDs are deleted from the video stream.

Ancillary data packet extraction and deletion is disabled when the IOPROC_EN bit is set

LOW.

Note 2: After the ancillary data determined by the ANC_TYPE_[5:1]_DS[2:1] registers

has been deleted, other existing ancillary data may not be contiguous. The device does

not concatenate the remaining ancillary data.

Note 3: Reading extracted ancillary data from the host interface must be performed

while there is a valid video signal present at the serial input and the device is locked

(LOCKED signal is HIGH).

The value of the active write pointer is written to a host interface accessible register

once per line, or at the end of the VANC period.

This allows a software only ANC data extraction application, which is only interfaced to

the device via the host interface, and does not have access to the Y/1ANC and C/2ANC

output flags, to determine when ANC data has been detected by the device.

4.21 Audio De-Embedder

Up to eight channels of audio may be extracted from the received serial digital video

stream. The output signal formats supported by the device include AES/EBU, I2S

(default), and industry standard serial digital formats.

16, 20, and 24-bit audio bit depths are supported for 48kHz synchronous audio for SD

data rates. For HD and 3G data rates, 16, 20, and 24-bit audio bit depths are supported

for 48kHz audio. The audio may be synchronous or asynchronous to the video.

In 3G mode:

•

In Level A mode, all Audio Control Packets are extracted from Data Stream 1 and all

Audio Data Packets are extracted from Data Stream 2, in accordance with SMPTE ST

425. This is similar to HD, in which Audio Control Packets are embedded in the

Luma channel and Audio Data Packets in the Chroma channel

•

In Level B mode, extraction of audio packets from Link A (default) or Link B is

selectable via the AUDIO_SEL_DS2_DS1 bit in the host interface.

Additional audio processing features include audio mute on loss of lock, de-embed and

delete, group selection, audio output re-mapping, ECC error detection and correction

(HD/3G modes only), and audio channel status extraction.

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