AK4543 Datasheet, PDF (24/31 Pages) Asahi Kasei Microsystems – AC’97 Rev 2.1 Multimedia Audio CODEC

[ASAHI KASEI]
[AK4543]
The next figure illustrates a state when all the mixers should work with the static volume settings that are
contained in their associated registers. This is used when the user is playing a CD (or external LINE_IN source)
through the AC ‘97 codec to the speakers but has most of the system in a low power mode. The procedure for this
follows the previous except that the analog mixer is never shut down.
PR0=1
PR1=1
PR4=1
Normal
ADCs off
PR0
DACs off
PR1
PR0=0
&
ADC=1
PR1=0
&
DAC=1
Digital
I/F
off
PR4
Warm Reset
AK4543 Powerdown/Powerup flow with analog still alive
Shut off
AC-Link
nPowerdown/Powerup sequence of multiple codec configuration
There can be up to 4 Codecs on the extended AC-link. Multiple Codec AC-link implementations must run off a
common BIT_CLK. The Primary Codec generates the master AC-link BIT_CLK for both the AC ’97 Digital
Controller and any Secondary Codecs. The AK4543 may be used as a master or slave in any systems using more
than one codec.
Digital Controller
SYNC
BIT_CLK
SDATA_OUT
RESET#
SDATA_IN0
SDATA_IN1
SDATA_IN2
SDATA_IN3
AC ‘97
SYNC
BIT_CLK
SDATA_OUT
RESET#
SDATA_IN
AC ‘97 or MC ‘97
SYNC
BIT_CLK
SDATA_OUT
RESET#
SDATA_IN
Optional 4th AC ‘97
SYNC
BIT_CLK
SDATA_OUT
RESET#
SDATA_IN
Multiple Codec Example
Under the multiple codec circumstances, there is no restriction on settingPR0(ADC), PR1(DAC),
PR2(Mixer), PR6(LNLVL_OUT) and PR7(EAPD) to “1” or “0”.
As suggested in the AC’97 Specification Rev2.1, the AC-Link Powerdown(PR”4”) and Vref
Powerdown(PR5=”1”) under the Multiple codec configuration are NOT recommended in order to continue
supplying BIT_CLK to the Secondary codecs.
<M0046-E-01>
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1999/01