CS8422 datasheet(49/82 Pages) CIRRUS

49 / 82 page

DS692F1

CS8422

01 - replace the current audio sample with all zeros (mute).

10 - do not change the received audio sample.

11 - reserved

CHS – Sets which channel's C data is decoded in the Receiver Channel Status register (11h) (Default = ‘0’)

0 - A channel

1 - B channel

If CHS = 0 and TRUNC = 1, both channels' audio data will be truncated by the AUX[3:0] bits indicated in

the channel A Channel Status data. If CHS = 1 and TRUNC = 1, both channels' audio data will be trun-

cated by the AUX[3:0] bits indicated in the channel B Channel Status data. This will occur even if the

AUX[3:0] bits indicated in the channel A Channel Status data are not equal to the AUX[3:0] bits indicated

in the channel B Channel Status data.

DETCI - D to E status transfer inhibit

0 -Allow update

1 -Inhibit update

DEM_CNTL[2:0] – De-emphasis filter control. See Figure 25 for De-emphasis filter response.

000 - De-emphasis filter off.

001 - 32 kHz setting

010 - 44.1 kHz setting

011 - 48 kHz setting

100 - Auto-detect Sample Rate. If the PLL estimates that the incoming sample rate is below 49 kHz, de-

emphasis will be applied according to the Channel Status data of the incoming AES3 or S/PDIF data. If

the PLL estimates that the incoming sample rate is not below 49 kHz, de-emphasis will not be enabled. If

the incoming Channel Status data indicates that no de-emphasis should be applied, de-emphasis will not

be enabled. If data is detected as being non-audio, the de-emphasis filter will not be enabled.

Figure 25. De-Emphasis Filter Response

Gain

-10dB

0dB

Frequency

T2 = 15 µs

T1=50 µs

3.183 kHz

10.61 kHz

CS8422 Datasheet(PDF) 49 Page - Cirrus Logic