82801BA Datasheet, PDF (58/498 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
3.5
Power Planes for Input Signals
Table 3-5 shows the power plane associated with each input signal, as well as what device drives
the signal at various times. Valid states include:
• High
• Low
• Static: Will be high or low, but will not change
• Driven: Will be high or low, and is allowed to change
• Running: For input clocks
Table 3-5. Power Plane for Input Signals
Signal Name
BATLOW#
(ICH2-M)
A20GATE
AC_BIT_CLK
AC_SDIN[1:0]
AGPBUSY#
(ICH2-M)
APICCLK
CLK14
CLK48
CLK66
EE_DIN
FERR#
INTRUDER#
IRQ[15:14]
LAN_CLK
RSM_PWROK
(ICH2)
LAN_PWROK
(ICH2-M)
LAN_RXD[2:0]
LDRQ[0]#
LDRQ[1]#
OC[3:0]#
PCICLK
PDDREQ
PIORDY
PME#
PWRBTN#
PWROK
RCIN#
REQ[0:5]#
REQ[B:A]#
Power Well
Driver During Reset
C3
(ICH2-M)
Resume I/O
Power Supply
High
Main I/O
Main I/O
Resume I/O
External Microcontroller
AC’97 Codec
AC’97 Codec
Static
Driven
Driven
Main I/O
AGP Component
Driven
Main I/O
Main I/O
Main I/O
Main Logic
LAN I/O
Main I/O
RTC
Main I/O
LAN I/O
Clock Generator
Clock Generator
Clock Generator
Clock Generator
EEPROM component
CPU
External Switch
IDE
LAN Connect component
Running
Running
Running
Running
Driven
Static
Driven
Driven
Driven
External RC Circuit (ICH2)
Resume I/O
Power Supply (ICH2-M)
High
LAN I/O
Main I/O
Main I/O
Resume I/O
Main I/O
Main I/O
Main I/O
Resume I/O
Resume I/O
Main I/O
Main I/O
Main I/O
Main I/O
LAN Connect component
LPC Devices
LPC Devices
External Pull-Ups
Clock Generator
IDE Device
IDE Device
Internal Pull-Up
Internal Pull-Up
System Power Supply
External Microcontroller
PCI Master
PC/PCI Devices
Driven
Driven
Driven
Driven
Running
Driven
Static
Driven
Driven
Driven
High
Driven
Driven
S1
High
Static
Low
Low
High
Low
Low
Low
Low
Driven
Static
Driven
Static
Driven
High
Driven
High
High
Driven
Low
Static
Static
Driven
Driven
Driven
High
Driven
Driven
S3
High
Low
Low
Low
Low
Low
Low
Low
Low
Note 1
Low
Driven
Low
Note 1
Static
Note 1
Low
Low
Driven
Low
Low
Low
Driven
Driven
Low
Low
Low
Low
S5
High
Low
Low
Low
Low
Low
Low
Low
Low
Note 1
Low
Driven
Low
Note 1
Static
Note 1
Low
Low
Driven
Low
Low
Low
Driven
Driven
Low
Low
Low
Low
3-6
82801BA ICH2 and 82801BAM ICH2-M Datasheet