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 

The audio buffer pointer offset can be reduced from 26 samples to 12 or 6 samples using

the OS_SEL[1:0] host interface register. The default setting is 26 samples (see Table 4-21).

When the OS_SEL[1:0] bits are set for 6-sample pointer offset, no boundary checking is

performed.

Table 4-21: Audio Buffer Pointer Offset Settings

OS_SEL[1:0]

00

01

10

Buffer Pointer Offset

26 samples (default)

12 samples

6 samples

The CLEAR_AUDIO bit in the host interface can be used to clear the FIFOs. When

asserted, this bit resets the FIFOs to the start-up state.

4.7.22 Audio Sample Distributions

4.7.22.1 525-line Audio Sample Distribution

This following sample distribution allows the embedding of 16 channels (4 audio

groups) of 24-bit sampled audio into the HANC of 525-line based video formats.

The sample distribution is established for group 1 and then offset by 1 line for each

subsequent group. The sample distribution is as follows (start line is 12):

{[3](10+G),([4],[3]15)15,[4],[3](11-G),[0],[3](3+G),([4],[3]15)15,[4/3],[3]12,[4],[3](4-G),[0]}5

[#] = Number of samples / line

[4/3] = One line with either 3 or 4 samples depending on five-frame sequence

(#) = Number of times to repeat the sequence. When this # is 0, no samples are inserted

G = Audio group number from 1 to 4

{…}5 = 5-frame sequence as shown in Table 4-22:

Table 4-22: 5-frame Sequence Sample Distribution

Frame

1

2

3

4

5

Number of samples

1602

1601

1602

1601

1602

GS1582 Multi-Rate Serializer with Cable Driver, Audio

Multiplexer and ClockCleanerTM

Data Sheet

40117 - 4

December 2011

60 of 115

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