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5.3 VIA VT8235CD South Bridge(9)
Power Management and Event Detection (Continued) Power Management and Event Detection (Continued)
Signal Name Pin # I/O Signal Description Signal Name Pin #I/O Signal Description
LID# / GPI4 AC1 I Notebook Computer Display Lid Open / Closed SUSST1# / Y3 O Suspend Status 1 (Rx94[4] = 0). Typically connected to
Monitor. Used by the Power Management subsystem to GPO3 the North Bridge to provide information on host clock
monitor the opening and closing of the display lid of status. Asserted when the system may stop the host clock,
notebook computers. Can be used to detect either such as Stop Clock or during POS, STR, or STD suspend
low-to-high or high-to-low transitions to generate an SMI#. states. Connect 10K PU to VSUS33.
(10K PU to VSUS33 if not used) SUSCLK AB3O Suspend Clock. 32.768 KHz output clock for use by the
INTRUDER# / AE1 I Intrusion Indicator. The value of this bit may be read at North Bridge (e.g., KT400A, CLE266, or P4X400) for
GPI16 PMIO Rx20[6] DRAM refresh purposes. Stopped during Suspend-to-Disk
THRM# / GPI18/ Y4 I Thermal Alarm Monitor. Rx8C[3] = 1. Rising or falling and Soft-Off modes. Connect 10K PU to VSUS33.
AOLGPI edges (selectable by PMIORx2C[6]) may be detected to set CPUMISS / Y1 I CPU Missing. Used to detect the physical presence of the
status at PMIO Rx20[10]. Setting of this status bit GPI17 CPU chip in its socket.
may then be used to generate an SCI or SMI. THRM# may High indicates no CPU present. Connect to the CPUMISS
also be used to enable duty cycle control of stop-clock pin of the CPU socket. The state of this pin may be read in
(STPCLK#) to automatically limit maximum temperature the SMBus 2 registers. This pin may be used as CPUMISS
(see Device 17 Function 0 Rx8C[7-4]). and GPI17 at the same time.
RING# / GPI3 Y2 I Ring Indicator. May be connected to external modem AOLGPI / Y4 I Alert On LAN. The state of this pin may be read in the
circuitry to allow the system to be re-activated by a GPI18/ THRM#SMBus 2 registers. This pinmay be used as AOLGPI,
received phone call. (10K PU to VSUS33 if not used) GPI18 and THRM# all at the same time.
BATLOW# / V4 I Battery Low Indicator. (10K PU to VSUS33 if not used)
GPI5 (3.3V only)
CPUSTP# / AC7 O CPU Clock Stop (RxE4[0] = 0). Signals the system clock
GPO5 generator to disable the CPU clock outputs. Not connected
if not used. Strap Pins for VT8235 Version CE Configuration
PCISTP# / AD6 O PCI Clock Stop (RxE4[1] = 0). Signals the system clock Signal Name Pin # FunctionDescription Note
GPO6 generator to disable the PCI clock outputs. Not connected if Strap_AUTO AE10Auto L: Enable Auto Reboot
not used. Reboot H: Disable Auto Reboot
SUSA# / GPO1 AA2 O Suspend Plane A Control (Rx94[2]=0). Asserted during (Default)
power management POS, STR, and STD suspend states. SPKR AF8CPU L: Enable CPU Frequency
Used to control the primary power plane. (10K PU to Frequency Strapping
VSUS33 if not used) StrappingH: Disable CPU Frequency
SUSB# / GPO2 AD3 O Suspend Plane B Control (Rx94[3]=0). Asserted during Strapping (Default)
power management STR and STD suspend states. Used to KBCS# AF10Internal L: Disable internal KBC
control the secondary power plane. (10K PU to VSUS33 KeyboardH: Enable internal KBC
if not used) Controller (Default)
SUSC# AF2 O Suspend Plane C Control. Asserted during power SDCS1# AF25 Eliminate L: Enable. Use external
management STD suspend state. External EEPROM (Default)
Used to control the tertiary power plane. Also connected to LAN H: Disable. Do not use
ATX power-on circuitry. (10K PU to VSUS33 if not used)EEPROM external EEPROM
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