CS44210

14

DS539PP1

4. REGISTER DESCRIPTIONS

4.1 Power and Muting Control (address 02h)

4.1.1 SOFT RAMP AND ZERO CROSS CONTROL (SZC)

Default = 10

00 - Immediate Change

01 - Zero Cross Control

10 - Ramped Control

11 - Reserved

Function:

Immediate Change

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

Zero Cross Control

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

time-out period of 512 sample periods (10.7 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.

Ramped Control

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.

Note: Ramped Control is not available in Double Speed Mode.

4.1.2 POWER DOWN (PDN)

Default = 1

0 - Disabled

1 - Enabled

Function:

The entire device will enter a low-power state when this function is enabled, and the contents of the control

registers are retained in this mode. The power-down bit defaults to ‘enabled’ on power-up and must be

disabled before normal operation in Control Port mode can occur.

76543

210

SZC1

SZC0

PDN

FLT

RUPBYP

RDNBYP

Reserved

Reserved

10100

000