GS1582 datasheet(39/115 Pages) SEMTECH

39 / 115 page

GS1582 Multi-Rate Serializer with Cable Driver, Audio

Multiplexer and ClockCleanerTM

Data Sheet

40117 - 4

December 2011

39 of 115

deleted from the video input, however arbitrary packets, SDTI packets and SMPTE 352M

packets are not deleted.

When the EN_CASCADE host interface bit is set HIGH, the audio multiplexer operates

in cascade mode. Up to two audio groups can be added to the video output. The added

groups will not replace existing embedded audio groups. No existing packets are

deleted from the video input, and the added audio packets are appended to the last

packet in the video input.

In cascade mode, if the audio multiplexer is configured to add group 1 audio data

packets with the same group number as an existing group, MUX_ERRA will be asserted

in the host interface. Similarly, MUX_ERRB will be asserted if the configuration leads to

replacing existing groups with group 2.

When the AGR bit in the host interface is set HIGH, the audio multiplexer operates in

group replacement mode. In this mode, added audio groups can replace existing

embedded audio groups. The embedded audio groups will be sorted by audio group

number. No packets will be deleted from the video input (except for the audio packets

being replaced). SDTI packets and SMPTE 352M packets are placed before the audio

packets, and arbitrary packets are placed after the audio packets in SD mode.

NOTE 1: When audio group replacement mode is selected, the cascade function is

disabled.

NOTE 2: In normal SD mode, if the incoming stream has a completely full HANC space,

the outgoing HANC space will only get filled with up to 235 words and the remainder of

the space is left blank. This will not occur if there are one or more words free in the

incoming HANC space.

NOTE 3: SD audio in cascade mode may only be inserted if the HANC space of the

incoming stream is not completely full. If the incoming stream has a full HANC space,

audio packets will be inserted beyond the HANC boundary. The space following the

inserted audio packets will then be blanked until the next EAV is detected in the video

stream. This will not occur if there are two or more words free at the end of the incoming

HANC space after the existing packets.

NOTE 4: HD audio in normal mode may only be inserted if the HANC space of the

incoming stream is not completely full. If the incoming stream has a full HANC space,

packets will be inserted beyond the HANC boundary. The space following the inserted

packets will then be blanked until the next EAV is detected in the video stream. This will

not occur if there are two or more words free at the end of the incoming HANC space

after the existing packets.

Table 4-3: Audio Multiplexer Modes of Operation

Host Interface Registers

Operating Mode

EN_CASCADE = 0, AGR = 0

Normal Mode

EN_CASCADE = 1, AGR = 0

Cascade Mode

EN_CASCADE = 0, AGR = 1

Audio Group Replacement Mode

EN_CASCADE = 1, AGR = 1

Audio Group Replacement Mode

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