CS44L10
4. REGISTER DESCRIPTIONS
4.1 Power and Muting Control (address 02h)
7
6
5
4
SZC1
SZC0
PDN
FLT
1
0
1
0
3
RUPBYP
0
2
RDNBYP
0
1
Reserved
0
0
Reserved
0
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.
DS541PP1
13