Guide

Platform Design Checklist
R
260 Intel
®
852GM Chipset Platform Design Guide
14.8.5. AC ’97 Interface
Pin Name System
Pull-up/Pull-down
Series
Termination
Resistor
Notes
9
AC_BIT_CLK
None
33-47
Ω
The internal pull-down resistor is controlled by the
AC’97 Global Control Register, ACLINK Shut Off
bit:
1 = enabled; 0 = disabled
When no AC'97 devices are connected to the
link, BIOS must set the ACLINK Shut Off bit for
the internal keeper resistors to be ENABLED. At
that point, pull-ups/pull-downs are NOT needed
on ANY of the link signals.
AC_SDATAIN[2:0]
None
33-47
Ω
A series termination resistor is required for the
PRIMARY CODEC.
A series termination resistor is required for the
SECONDARY and TERTIARY CODEC if the
resistor is not found on CODEC.
AC_SDATAOUT
None
33-47
Ω
A series termination resistor is required for the
PRIMARY CODEC.
One series termination resistor is required for the
SECONDARY/ TERTIARY CODEC connector
card if the resistor is not found on the connector
card.
AC_SYNC
None
33-47
Ω
A series termination resistor is required for the
PRIMARY CODEC.
One series termination resistor is required for the
SECONDARY/ TERTIARY CODEC connector
card if the resistor is not found on the connector
card.