GS1582-IBE3 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
Manufacturer
GS1582-IBE3
Semtech Corporation
GS1582-IBE3 Datasheet PDF : 115 Pages
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4.7.16.2 HD Audio Multiplexing
If the ASXA bit of the host interface is set to asynchronous audio, the GS1582 will set the
AFN of the group 1 control packets to zero. The GS1582 will also set the AFN of the group
1 control packets to zero if the AFNA_AUTO bit in the host interface is not set. The same
relationship holds for the ASXB and AFNB_AUTO bits for group 2.
The GS1582 will detect video standards with 29.97 and 59.94 frame rates by using the
5-frame sequence detect block. If a 5-frame sequence is detected, the Audio Frame
Number word in the audio control packets will be embedded with the running sequence
1 through 5.
The GS1582 will add the offset specified in the AFN_OFS[2:0] host interface field to the
generated AFN. The result will wrap around, leaving the resulting AFN in the range of 1
through 5.
In cases where each frame has the same number of samples, the Multiplexer will set the
AFN to zero for every frame. These cases are shown in Table 4-13. In cases where each
frame has a different number of samples, the sequences shown in Table 4-14 are used.
Table 4-13: Frame Rates with AFN = 0
Frame Rate (fps)
30
25
60
24
23.98
Samples per Video Frame
1600
1920
800
2000
2002
Table 4-14: Frame Rates with varying samples per frame
Frame Rate (fps) Samples,
AFN = 11
Samples,
AFN = 21
29.97
1602
59.94
801
NOTES:
1. AFNs are assuming AFN_OFS = 0.
1601
800
Samples,
AFN = 31
1602
801
Samples,
AFN = 41
1601
801
Samples,
AFN = 51
1602
801
4.7.17 Audio Input Format
The GS1582 accepts two audio input formats, AES/EBU digital audio input and serial
digital audio input, as listed in Table 4-15. The serial audio input can be formatted in the
following five modes:
• I2S
• Left Justified; MSB first
GS1582 Multi-Rate Serializer with Cable Driver, Audio
Multiplexer and ClockCleanerTM
Data Sheet
40117 - 4
December 2011
53 of 115
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