Cirrus Logic CS4207 - Manual (Page 135)

DS880F4 135
CS4207
6.15.6.5 Beep Configuration (CIR = 0004h)
1:0 Read/Write 10b
DAC1 SZCMode[1:0]: Sets the soft ramp and
zero crossing detection modes by which volume
and muting changes will be implemented.
‘00’b - Immediate Change: When immediate
change is selected, all level changes will take
effect immediately in one step
‘01’b - Zero Cross: Dictates that signal level
changes, both muting and gain/attenuation, will
occur on a signal zero crossing to minimize audi-
ble artifacts. The requested level change will
occur after a timeout period of 512/Fs (approxi-
mately 11 ms @ Fs = 48 kHz) if the signal does
not encounter a zero crossing.
‘10’b - Soft Ramp: Allows level changes, both
muting and gain/attenuation, to be implemented
by incrementally ramping, in 1/8 dB steps, from
the current level to the new level at a rate of
1/8 dB per audio sample period.
‘11’b - Soft Ramp on Zero Cross: Dictates that
signal level changes, both muting and gain/atten-
uation, will occur in 1/8 dB steps and be imple-
mented on a signal zero crossing. The 1/8 dB
level change will occur after a timeout period of
512/Fs (approximately 11 ms @ Fs = 48 kHz) if
the signal does not encounter a zero crossing.
Both soft ramp and zero cross are independently
monitored and implemented for each channel.
Bits Type Default Description
15:5 Read Only 0 Reserved
4 Read/Write 0b
DMIC2 Enable: Specifies whether GPIO1 or Dig-
ital Mic Interface 2 is enabled.
‘0’b - GPIO1 enabled, Digital Mic 2 disabled.
‘1’b - Digital Mic 2 enabled, GPIO1 disabled.
3 Read/Write 0b
DMIC1 Enable: Specifies whether GPIO0 or Dig-
ital Mic Interface 1 is enabled.
‘0’b - GPIO0 enabled, Digital Mic 1 disabled.
‘1’b - Digital Mic 1 enabled, GPIO0 disabled.
2 Read/Write 1b
DAC3 Beep Enable: This bit allows the output
from the beep generator to be passed to DAC3.
1 Read/Write 1b
DAC2 Beep Enable: This bit allows the output
from the beep generator to be passed to DAC2.
0 Read/Write 1b
DAC1 Beep Enable: This bit allows the output
from the beep generator to be passed to DAC1.
Bits Type Default Description