CS48L32 datasheet(32/192 Pages) CIRRUS

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Cirrus Logic

DS1219F4

CS48L32

4.2 Input Signal Path

Note: The 0 dBFS level of the IN1–IN2 digital input paths is not equal to the 0 dBFS level of the CS48L32 digital core.

The maximum digital input signal level is –6 dBFS (see Table 3-7). Under 0 dB gain conditions, a –6 dBFS input

signal corresponds to a 0 dBFS input to the CS48L32 digital core functions.

The digital volume control registers are described in Table 4-4.

4.2.8

Input Signal Path Signal-Detect Control

The CS48L32 provides a digital signal-detect function for the input signal path. This enables system actions to be triggered

by signal detection and allows the device to remain in a low-power state until a valid audio signal is detected. A mute

function is integrated with the signal-detect circuit, ensuring the respective digital audio path remains at zero until the

detection threshold level is reached. Signal detection is also indicated via the interrupt controller.

Table 4-4. Input Signal Path Digital Volume Control

Bit

Label

Default

Description

R16404 (0x4014)

INPUT_

CONTROL3

IN_VU

See

Footnote 1

Input signal paths volume and mute update.

Writing 1 to this bit causes the IN1–IN2 input signal paths volume and mute

settings to be updated simultaneously.

R16424 (0x4028)

IN1L_CONTROL2

IN1L_MUTE

Input Path 1 (Left) Digital Mute

0 = Unmute

1 = Mute

23:16 IN1L_VOL[7:0]

0x80

Input Path 1 (Left) Digital Volume, –64 dB to +31.5 dB in 0.5 dB steps

0x00 = –64 dB

0x01 = –63.5 dB

… (0.5 dB steps)

0x80 = 0 dB

… (0.5 dB steps)

0xBF = +31.5 dB

0xC0 to 0xFF = Reserved

R16456 (0x4048)

IN1R_CONTROL2

IN1R_MUTE

Input Path 1 (Right) Digital Mute

0 = Unmute

1 = Mute

23:16 IN1R_VOL[7:0]

0x80

Input Path 1 (Right) Digital Volume, –64 dB to +31.5 dB in 0.5 dB steps

0x00 = –64 dB

0x01 = –63.5 dB

… (0.5 dB steps)

0x80 = 0 dB

… (0.5 dB steps)

0xBF = +31.5 dB

0xC0 to 0xFF = Reserved

R16488 (0x4068)

IN2L_CONTROL2

IN2L_MUTE

Input Path 2 (Left) Digital Mute

0 = Unmute

1 = Mute

23:16 IN2L_VOL[7:0]

0x80

Input Path 2 (Left) Digital Volume, –64 dB to +31.5 dB in 0.5 dB steps

0x00 = –64 dB

0x01 = –63.5 dB

… (0.5 dB steps)

0x80 = 0 dB

… (0.5 dB steps)

0xBF = +31.5 dB

0xC0 to 0xFF = Reserved

R16520 (0x4088)

IN2R_CONTROL2

IN2R_MUTE

Input Path 2 (Right) Digital Mute

0 = Unmute

1 = Mute

23:16 IN2R_VOL[7:0]

0x80

Input Path 2 (Right) Digital Volume, –64 dB to +31.5 dB in 0.5 dB steps

0x00 = –64 dB

0x01 = –63.5 dB

… (0.5 dB steps)

0x80 = 0 dB

… (0.5 dB steps)

0xBF = +31.5 dB

0xC0 to 0xFF = Reserved

R16968 (0x4248)

INPUT_VOL_

CONTROL

6:4

IN_VD_RAMP[2:0]

010

Input Volume Decreasing Ramp Rate (seconds/6 dB).

This field should not be changed while a volume ramp is in progress.

000 = 0 ms

001 = 0.5 ms

010 = 1 ms

011 = 2 ms

100 = 4 ms

101 = 8 ms

110 = 15 ms

111 = 30 ms

2:0

IN_VI_RAMP[2:0]

010

Input Volume Increasing Ramp Rate (seconds/6 dB).

This field should not be changed while a volume ramp is in progress.

000 = 0 ms

001 = 0.5 ms

010 = 1 ms

011 = 2 ms

100 = 4 ms

101 = 8 ms

110 = 15 ms

111 = 30 ms

1. Default is not applicable to these write-only bits

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