CS43L41

18

DS473PP1

4.7

CHANNEL A VOLUME = CHANNEL B VOLUME

Volume and Mixing Control Register (address 02h)

Access:

Default:

0 - Disabled

Function:

The AOUTA and AOUTB volume levels are independently controlled by the A and the B Channel Vol-

ume Control Bytes when this function is disabled. The volume on both AOUTA and AOUTB are de-

termined by the A Channel Volume Control Byte and the B Channel Byte is ignored when this function

is enabled.

4.8

SOFT RAMP OR ZERO CROSS ENABLE

Volume and Mixing Control Register (address 02h)

Access:

Default:

10 - Soft Ramp enabled.

Function:

Soft Ramp Enable

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

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

periods.

Zero Cross Enable

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 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 mon-

itored and implemented for each channel.

765

4321

0

A = B

Soft

Zero Cross

ATAPI4

ATAPI3

ATAPI2

ATAPI1

ATAPI0

A = B

MODE

0

Disabled

1

Enabled

Table 7. A=B Volume Control Enable

765

4321

0

A = B

Soft

Zero Cross

ATAPI4

ATAPI3

ATAPI2

ATAPI1

ATAPI0