CM6571 Datasheet, PDF (43/63 Pages) C-Media Electronics – USB 2.0 full speed-compliant

Mode State Diagram Controlled by I2C Bus
No
Power
Power and
clock supplied
Initialization
(Boot / Get
parameters/codes
from Baseband /Set
I2C mode Control)
00
01
10
11
CM6571
USB Audio Sound Chip
Power
Down
00
ENC
01
On
11
01
Bypass
10
11
Suspend
01
00
10
11
00
10
Power Down Mode－ ENC On Mode－
Bypass Mode－
 Digital power level 2:  Digital power level 4:  Digital power level 3:
DSP core is operated at Normal operation
By-pass DSP Core
a lowest frequency  Analog power level 4: processing
 Analog power level 2: Normal operation
 Analog power level 4:
Analog keeps digital
Normal operation
core/PLL LDO voltages
on
Suspend Mode－
 Digital power level 2:
DSP core is operated at
a lowest frequency
 Analog power level 2:
Analog keeps digital
core/PLL LDO voltages
on
Figure 9.2 Mode State Diagram (by I2C interface)
Revised: Nov. 2012
Page 43 / 63
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