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Power Management and Event Detection (Continued)
Signal Name Pin # I/O Signal Description
LID# / GPI4
AC1 I Notebook Computer Display Lid Open / Closed
Monitor. Used by the Power Management subsystem to
monitor the opening and closing of the display lid of
notebook computers. Can be used to detect either
low-to-high or high-to-low transitions to generate an SMI#.
(10K PU to VSUS33 if not used)
INTRUDER# /
GPI16
AE1 I
Intrusion Indicator. The value of this bit may be read at
PMIO Rx20[6]
THRM# / GPI18/
AOLGPI
Y4 I
Thermal Alarm Monitor. Rx8C[3] = 1. Rising or falling
edges (selectable by PMIORx2C[6]) may be detected to set
status at PMIO Rx20[10]. Setting of this status bit
may then be used to generate an SCI or SMI. THRM# may
also be used to enable duty cycle control of stop-clock
(STPCLK#) to automatically limit maximum temperature
(see Device 17 Function 0 Rx8C[7-4]).
RING# / GPI3
Y2 I
Ring Indicator. May be connected to external modem
circuitry to allow the system to be re-activated by a
received phone call. (10K PU to VSUS33 if not used)
BATLOW# /
GPI5
V4 I
Battery Low Indicator. (10K PU to VSUS33 if not used)
(3.3V only)
CPUSTP# /
GPO5
AC7 O
CPU Clock Stop (RxE4[0] = 0). Signals the system clock
generator to disable the CPU clock outputs. Not connected
if not used.
PCISTP#
/
GPO6
AD6 O
PCI Clock Stop
(RxE4[1] = 0). Signals the system clock
generator to disable the PCI clock outputs. Not connected if
not used.
SUSA# / GPO1
AA2 O
Suspend Plane A Control (Rx94[2]=0). Asserted during
power management POS, STR, and STD suspend states.
Used to control the primary power plane. (10K PU to
VSUS33 if not used)
SUSB# / GPO2
AD3 O
Suspend Plane B Control (Rx94[3]=0). Asserted during
power management STR and STD suspend states. Used to
control the secondary power plane. (10K PU to VSUS33
if not used)
SUSC# AF2 O
Suspend Plane C Control. Asserted during power
management STD suspend state.
Used to control the tertiary power plane. Also connected to
ATX power-on circuitry. (10K PU to VSUS33 if not used)
Power Management and Event Detection (Continued)
Signal Name Pin # I/O Signal Description
SUSST1# /
GPO3
Y3 O
Suspend Status 1 (Rx94[4] = 0). Typically connected to
the North Bridge to provide information on host clock
status. Asserted when the system may stop the host clock,
such as Stop Clock or during POS, STR, or STD suspend
states. Connect 10K PU to VSUS33.
SUSCLK AB3 O
Suspend Clock.
32.768 KHz output clock for use by the
North Bridge (e.g., KT400A, CLE266, or P4X400) for
DRAM refresh purposes. Stopped during Suspend-to-Disk
and Soft-Off modes. Connect 10K PU to VSUS33.
CPUMISS /
GPI17
Y1 I
CPU Missing. Used to detect the physical presence of the
CPU chip in its socket.
High indicates no CPU present. Connect to the CPUMISS
pin of the CPU socket. The state of this pin may be read in
the SMBus 2 registers. This pin may be used as CPUMISS
and GPI17 at the same time.
AOLGPI
/
GPI18/ THRM#
Y4 I
Alert On LAN.
The state of this pin may be read in the
SMBus 2 registers. This pinmay be used as AOLGPI,
GPI18 and THRM# all at the same time.
Strap Pins for VT8235 Version CE Configuration
Signal Name Pin # Function Description Note
Strap_AUTO
AE10 Auto
Reboot
L: Enable Auto Reboot
H: Disable Auto Reboot
(Default)
SPKR
AF8 CPU
Frequency
Strapping
L: Enable CPU Frequency
Strapping
H: Disable CPU Frequency
Strapping (Default)
KBCS#
AF10 Internal
Keyboard
Controller
L: Disable internal KBC
H: Enable internal KBC
(Default)
SDCS1#
AF25
Eliminate
External
LAN
EEPROM
L: Enable. Use external
EEPROM (Default)
H: Disable. Do not use
external EEPROM
5.3 VIA VT8235CD South Bridge(9)
MiTac Secret
Confidential Document