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2-26 Service Guide
Signal
Name
Multiplexed
With
Default Control Register
and Bit (PCI
Function 1)
Notes
GPO0 GPO Non-multiplexed GPO which is always available.
GPO[1:7] LA[17:23] GPO GENCFG
Bit 0
Available as GPO only if EIO mode.
GPO8 GPO Non-multiplexed GPO which is always available.
The GPO[8] signal will be driven low upon removal
of power from the PIIX4 core power plane.
GPO[9:11] GNT[A:C]# GPO GENCFG
Bits [8:10]
Not available as GPO if using for PC/PCI. Can be
individually enabled, so GPO[11] is available if
REQ[C]# not used.
GPO12 APICACK# GPO XBCS
Bit 8
Not available as GPO if using external APIC.
GPO13 APICCS# GPO XBCS
Bit 8
Not available as GPO if using external APIC.
GPO14 IRQ0 GPO XBCS
Bit 8
Not available as GPO if using external APIC.
GPO15 SUSB# SUSB# GENCFG
Bit 17
Not available as GPO if using for power
management.
GPO16 SUSC# SUSC# GENCFG
Bit 17
Not available as GPO if using for power
management.
GPO17 CPU_STP# CPU_STP# GENCFG
Bit 18
Not available as GPO if using for clock control.
GPO18 PCI_STP# PCI_STP# GENCFG
Bit 19
Not available as GPO if using for clock control.
GPO19 ZZ ZZ GENCFG
Bit 20
Not available as GPO if using for power
management.
GPO20 SUS_STAT1# SUS_STAT1# GENCFG
Bit 21
Not available as GPO if using for power
management.
GPO21 SUS_STAT2# SUS_STAT2# GENCFG
Bit 22
Not available as GPO if using for power
management.
GPO22 XDIR# XDIR# GENCFG
Bit 28
Not available as GPO if using X-bus transceiver.
GPO23 XOE# XOE# GENCFG
Bit 28
Not available as GPO if using X-bus transceiver.
GPO24 RTCCS# RTCCS# GENCFG
Bit 29
Not available as GPO if using external RTC that
doesn’t do self decode.
GPO25 RTCALE RTCALE GENCFG
Bit 30
Not available as GPO if using external RTC that
doesn’t do self decode.
GPO26 KBCCS# KBCCS# GENCFG
Bit 31
Not available as GPO if using external KBC that
doesn’t do self decode.
GPO[27:28] GPO Non-multiplexed GPOs which are always available.
GPO29 IRQ9OUT# GPO XBCS
Bit 8
Not available as GPO if using external APIC. This
signal is used for IRQ9 output in APIC mode, where
it is level triggered, active low.
GPO30 GPO Non-multiplexed GPO which is always available.
Table 2-2 82371AB Pin Descriptions (continued)
Name Type Description
OTHER SYSTEM AND TEST SIGNALS