GS3471 datasheet(86/179 Pages) SEMTECH

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GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

86 of 179

Semtech

www.semtech.com

4.21.3.4 Audio Crosspoint Block

The Audio Crosspoint is used for audio output channel re-mapping. This feature allows

any of the selected audio channels in Group A or Group B to be output on any of the

eight output channels. The default setting is for one to one mapping, where AOUT_1_2

is extracted from Group A CH1 and CH2, AOUT_3_4 is extracted from Group A CH3 and

CH4, and so on.

Note: If audio samples from embedded audio packets with the group set in IDA[1:0] are

to be paired with samples from the group set in IDB[1:0], all of the channels must have

been derived from the same Word Clock and must be synchronous.

The output channel is set in the OP[8:1]_SRC parameter of the OUTPUT_SEL_[2:1]

registers. Table 4-22 lists the 3-bit address for audio channel mapping.

4.21.3.5 Serial Audio Output Word Length

The audio output, in Serial mode, has a selectable 24, 20, or 16-bit sample word length.

The ASWL[D:A] parameter is used to configure the audio output sample word length.

Table 4-23 shows the host interface 2-bit code for setting the audio sample word length.

When the presence of extended audio packets is detected in SD mode, the audio

de-embedder defaults to 24-bit audio sample word length.

Table 4-22: Audio Channel Mapping Codes

Audio Output Channel

3-bit Host Interface

Source Address

000b

001b

010b

011b

100b

101b

110b

111b

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