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82801AB Datasheet(PDF) 46 Page - Intel Corporation

Part # 82801AB
Description  82801AB (ICH0) I/O Controller Hub
PDF  414 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

82801AB Datasheet(HTML) 46 Page - Intel Corporation

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Power Planes and Pin States
3-4
82801AB and 82801AA Datasheet
3.3
Power Planes for Input Signals
Table 3-3 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 3-3. Power Plane for Input Signals
Signal Name
Power Well
Driver During Reset
S1
S3
S5
A20GATE
Core
External Microcontroller
Static
Low
Low
AC_BIT_CLK
Core
AC’97 Codec
Low
Low
Low
AC_SDIN[1:0]
Resume
AC’97 Codec
Low
Low
Low
APICCLK
Core
Clock Generator
Running
Low
Low
CLK14
Core
Clock Generator
Running
Low
Low
CLK48
Core
Clock Generator
Running
Low
Low
FERR#
Core
Processor
Static
Low
Low
CLK66
Hub Interface
Clock Generator
Running
Low
Low
INTRUDER#
RTC
External Switch
Driven
Driven
Driven
IRQ[15:14]
Core
IDE
Driven
Low
Low
LDRQ[0]#
Core
LPC Devices
High
Low
Low
LDRQ[1]#
Resume
LPC Devices
High
Low
Low
OC[1:0]#
Resume
External Pull-Ups
Defined
Defined
Defined
PCICLK
Core
Clock Generator
Running
Low
Low
PDDREQ
Core
IDE Device
Static
Low
Low
PIORDY
Core
IDE Device
Static
Low
Low
PME#
Resume
Internal Pull-Up
Driven
Driven
Driven
PWRBTN#
Resume
Internal Pull-Up
Driven
Driven
Driven
PWROK
Core
System Power Supply
Driven
Low
Low
RCIN#
Core
External Microcontroller
High
Low
Low
REQ[0:3]#
Core
PCI Master
Driven
Low
Low
REQ[4:5]#
(ICH only: 82801AA)
Core
PCI Master
Driven
Low
Low
REQ[B:A]#
Core
PC/PCI Devices
Driven
Low
Low
RI#
Resume
Serial Port Buffer
Driven
Defined
Defined
RSMRST#
RTC
External RC circuit
High
High
High
RTCRST#
RTC
External RC circuit
High
High
High
SDDREQ
Core
IDE Drive
Static
Low
Low
SERR#
Core
PCI Bus Peripherals
High
Low
Low
SIORDY
Core
IDE Drive
Static
Low
Low
THRM#
Core
Thermal Sensor
Driven
Low
Low



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