GS1582-IBE3 View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

GS1582-IBE3

Multi-Rate Serializer with Cable Driver, Audio Multiplexer and ClockCleaner™

Semtech Corporation 

On lines where the EDH packet is present, the audio data will be embedded up to the

point reserved for the EDH packet. If there is insufficient HANC space available, the

EDH packet is always re-inserted and the audio data packet discarded.

In the case where there is insufficient room in the HANC space to embed the selected

audio data packets, the multiplexer core will delete any arbitrary data packets. If there

is still insufficient room in the HANC space, the multiplexer core will not embed audio

data packets.

4.7.7 Audio Insertion After Video Switching Point

4.7.7.1 SD Formats

The switching lines for SD formats are defined in SMPTE RP 168 as lines 10 and 273 for

525-line based formats, and lines 6 and 319 for 625-line based formats. The audio core

does not place any audio data or control packets in the line immediately after the video

switching line. For example, with the standard switch point of line 10 for field 1 in 525,

there will be no audio data or control packets on line 11. The next packets will appear on

line 12.

4.7.7.2 HD Formats

The video switching lines for HD formats are defined in SMPTE 299M as lines 7 and 569.

The audio core does not place any audio data or control packets in the line immediately

after the video switching point. For example, with the standard switch point of line 7 for

field 1, there will be no audio data packets in line 8. The next packets will appear on line

9. The audio control packets will be multiplexed once per field, two lines after the video

switch point, on lines 9 and 571.

4.7.8 Audio Data Packets

4.7.8.1 SD Formats

Figure 4-12 shows the structure of the SD audio data packet as defined in SMPTE 272M.

Table 4-5 lists the descriptions of the audio data packet words. The audio core

automatically generates certain audio data packet words, as shown in Table 4-5.

Audio Sample Words

X X+1 X+2 X X+1 X+2 X X+1 X+2 X X+1 X+2

Figure 4-12: SD Audio Data Packet Structure

X X+1 X+2 X X+1 X+2

GS1582 Multi-Rate Serializer with Cable Driver, Audio

Multiplexer and ClockCleanerTM

Data Sheet

40117 - 4

December 2011

42 of 115

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