82801BA Datasheet, PDF (53/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

Power Planes and Pin States
Power Planes and Pin States
3
3.1
Power Planes
Table 3-1. ICH2 Power Planes
Plane
Main I/O
(3.3V)
Description
Vcc3_3: Powered by the main power supply (or battery for the ICH2-M). 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 (or battery for the ICH2-M). 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 (or battery for the ICH2-M) in S0–S1
states. Powered by the trickle power supply (or battery for the ICH2-M) when the
system is in the S3, S4, S5, state. Assumed to be shut off only when in the G3 state
(system is unplugged for the ICH2 or battery removed for the ICH2-M).
Resume Logic
(1.8V Standby)
VccSUS1_8: Powered by the main power supply (or battery for the ICH2-M) in S0–S1
states. Powered by the trickle power supply (or battery for the ICH2-M) when the
system is in the S3, S4, S5, state. Assumed to be shut off only when in the G3 state
(system is unplugged for the ICH2 or batter removed for the ICH2-M).
Processor Interface V_CPU_IO: Powered by the main power supply via processor voltage regulator. When
(1.3 ~ 2.5V)
the system is in the S3, S4, S5, or G3 state, this plane is assumed to be shut off.
LAN I/O
(3.3V)
(ICH2-M only)
VccLAN3_3: This is a separate power plane that may or may not be energized in S3 -
S5 states depending upon the presence or absence of AC power and network
connectivity. This plane must be on in the S0 and S1 states.
LAN Logic
(1.8V)
(ICH2-M only)
VccLAN1_8: This is a separate power plane that may or may not be energized in S3 -
S5 states depending upon the presence or absence of AC power and network
connectivity. This plane must be on in the S0 and S1 states.
RTC
VccRTC: When other power is available (from the main supply for the ICH2 or battery
for the ICH2-M), external diode coupling will provide power to reduce the drain on the
RTC battery. Assumed to operate from 3.3V down to 2.0V.
3.2
Integrated Pull-Ups and Pull-Downs
Table 3-2. Integrated Pull-Up and Pull-Down Resistors
Signal
Resistor Type
EE_DIN
EE_DOUT
GNT[B:A]# / GNT[5]# / GPIO[17:16]
LAD[3:0]# / FWH[3:0]#
LDRQ[1:0]
PME#
PWRBTN#
SPKR
AC_BITCLK
pull-up
pull-up
pull-up
pull-up
pull-up
pull-up
pull-up
pull-up
pull-down
Nominal Value
24 KΩ
24 KΩ
24 KΩ
24 KΩ
24 KΩ
24 KΩ
24 KΩ
24 KΩ
20 KΩ
Notes
1
1
1
1
1
1
1
1, 5
2, 6
82801BA ICH2 and 82801BAM ICH2-M Datasheet
3-1