CS4364 datasheet(38/50 Pages) CIRRUS

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DS619A1

CS4364

5.7.3

Single Volume Control (SNGLVOL)

Default = 0

0 - Disabled

1 - Enabled

Function:

The individual channel volume levels are independently controlled by their respective Volume Control

Bytes when this function is disabled. The volume on all channels is determined by the A1 Channel Volume

Control Byte, and the other Volume Control Bytes are ignored when this function is enabled.

5.8

Ramp and Mute (address 08h)

5.8.1

Soft Ramp and Zero Cross Control (SZC)

Default = 10

00 - Immediate Change

01 - Zero Cross

10 - Soft Ramp

11 - Soft Ramp on Zero Crossings

Function:

Immediate Change

When Immediate Change is selected all level changes will take effect immediately in one step.

Zero Cross

Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will occur

on a signal zero crossing to minimize audible artifacts. The requested level change will occur after a tim-

eout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal

does not encounter a zero crossing. The zero cross function is independently monitored and implemented

for each channel.

Soft Ramp

Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally ramp-

ing, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock periods.

Soft Ramp on Zero Crossing

Soft Ramp and Zero Cross Enable dictates that signal level changes, either by attenuation changes or

muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level change

will occur after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz

sample rate) if the signal does not encounter a zero crossing. The zero cross function is independently

monitored and implemented for each channel.

5.8.2

Soft Volume Ramp-Up After Error (RMP_UP)

Function:

543

SZC1

SZC0

RMP_UP

RMP_DN

PAMUTE

DAMUTE

MUTE_P1

MUTE_P0

111

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