Specifications

Intel
®
810E2 Chipset Platform
R
66 Design Guide
Figure 34. CDC_DN_ENAB# Support Circuitry for Multi-Channel Audio Upgrade
Primary
Audio
Codec
RESET#
SDATA_IN
Audio
Codec
RESET#
ID0#
SDATA_IN
AC97_RESET#
CDC_DN_ENAB#
CNR BoardMotherboard
R
A
10kohms
To General
Purpose Input
From AC '97
Controller
CNR Connector
SDATA_IN0
SDATA_IN1
To AC '97
Digital
Controller
Vcc
R
B
100kohms
Figure 35 shows the circuitry required on the motherboard to support a two-codec down configuration.
This circuitry disables the codec on a single codec CNR. Notice that in this configuration the resistor R
B
has been changed to 100 kΩ.
Figure 35. CDC_DN_ENAB# Support Circuitry for Two-Codecs on Motherboard / One-Codec on
CNR
Primary
Audio
Codec
RESET#
SDATA_IN
Audio
Codec
RESET#
ID0#
SDATA_IN
AC97_RESET#
CDC_DN_ENAB#
CNR BoardMotherboard
R
A
10kohms
To General
Purpose Input
From AC '97
Controller
CNR Connector
SDATA_IN0
SDATA_IN1
To AC '97
Digital
Controller
Secondary
Codec
RESET#
SDATA_IN
Vcc
R
B
100kohms