Mobile Intel Pentium 4 Processor - M and Intel 845MP/MZ Chipset Platform Design Guide

Mobile Intel
®
Pentium
®
4 Processor-M and Intel
®
845MP/845MZ Chipset Platform
Design Guide 199
R
Table 85. System Management Interface (SM-BUS)
ICH3-M – System Management Interface
Signal System
Pull-up/Pull-down
Ω
ΩΩ
Ω Notes 9
99
9
SM_LINK[1:0] Pull-up to
V3_3ALWAYS
4.7 kΩ
SM_INTRUDER# Pull-up to
V3_3ALWAYS
100 kΩ Pull signal to VCCRTC (VBAT) if not
needed
SMB_ALERT#/
GPIO11
Pull-up to
V3_3ALWAYS
10 kΩ Pull-up only if using this signal as
SMB_ALERT#
SMB_CLK,
SMB_DATA
Pull-up to
V3_3ALWAYS
10 kΩ
Table 86. AC ’97 Interface
ICH3-M – AC ’97 Interface
Signal System
Pull-up/Pull-down
Ω
ΩΩ
Ω Series
Damping
Notes 9
99
9
AC_BITCLK Has internal pull-down 20 kΩ
enabled only when AC_SHUT
bit is set to 1
AC_SYNC 33 Ω No extra pull-down resistors
required. Some
implementations add
termination for signal integrity.
AC_SDATAIN [1:0] External pull-down not required
AC_SDATAOUT Has internal pull-down 20 kΩ
enabled only when AC_SHUT
bit is set to 1
Table 87. Power Management Interface
ICH3-M – Power Management Interface
Signal System
Pull-up/Pull-
down
Ω
ΩΩ
Ω Series
Damping
Notes 9
99
9
PM_CLKRUN#/
GPIO24
Pull-up to V3.3S 10 kΩ
PM_RI# Pull-up to
V3_3ALWAYS
8.2 kΩ
PM_THRM# Pull-up to V3.3S 8.2 kΩ Pull-up required only if temperature
sensor not used; Alternative system
can be 2.7 k
Ω to V5S;
External pull-up/down not required if
connecting to temperature sensor