Intel
82801BA ICH2 Datasheet
3-1
ICH2 Power Planes and Pin States
ICH2 Power Planes and Pin States
3
3.1
Power Planes
3.2
Integrated Pull-Ups and Pull-Downs
Table 3-1. ICH2 Power Planes
Plane
Main I/O
(3.3V)
Description
Vcc3_3:
Powered by the main power supply. When the system is in the S3, S4, S5, or
G3 state, this plane is assumed to be shut off.
Main Logic
(1.8V)
Vcc1_8:
Powered by the main power supply. When the system is in the S3, S4, S5, or
G3 state, this plane is assumed to be shut off.
Resume I/O
(3.3V Standby)
VccSUS3_3:
Powered by the main power supply in S0 - S1 states. Powered by the
trickle power supply when the system is in the S3, S4, S5, state. Assumed to be shut off
only when in the G3 state (system is unplugged).
Resume Logic
(1.8V Standby)
VccSUS1_8:
Powered by the main power supply in S0 - S1 states. Powered by the
trickle power supply when the system is in the S3, S4, S5, state. Assumed to be shut off
only when in the G3 state (system is unplugged).
Processor Interface
(1.3 ~ 2.5V)
V_CPU_IO:
Powered by the main power supply via processor voltage regulator. When
the system is in the S3, S4, S5, or G3 state, this plane is assumed to be shut off.
RTC
VccRTC:
When other power is available (from the main supply), external diode
coupling will provide power to reduce the drain on the RTC battery. Assumed to operate
from 3.3V down to 2.0V.
Table 3-2. Integrated Pull-Up and Pull-Down Resistors
Signal
Resistor Type
Nominal Value
Notes
EE_DIN
pull-up
24 K
1
EE_DOUT
pull-up
24 K
1
GNT[B:A]# / GNT[5]# / GPIO[17:16]
pull-up
24 K
1
LAD[3:0]# / FWH[3:0]#
pull-up
24 K
1
LDRQ[1:0]
pull-up
24 K
1
PME#
pull-up
24 K
1
PWRBTN#
pull-up
24 K
1
SPKR
pull-up
24 K
1, 5
AC_BITCLK
pull-down
20 K
2, 6
AC_SDIN[0]
pull-down
20 K
2, 6
AC_SDIN[1]
pull-down
20 K
2, 6
AC_SDOUT
pull-down
20 K
2, 6
AC_SYNC
pull-down
20 K
2, 6
LAN_RXD[2:0]
pull-down
20 K
2, 6
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