8666 N/B Maintenance8666 N/B Maintenance
5.3 VT8235CE 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
Strap Pins for VT8235 Version CE Configuration
if not used.
Signal Name Pin # FunctionDescription Note
PCISTP# / AD6 O PCI Clock Stop (RxE4[1] = 0). Signals the system clock
Strap_AUTO AE10Auto L: Enable Auto Reboot
GPO6 generator to disable the PCI clock outputs. Not connected if
Reboot H: Disable Auto Reboot
not used.
(Default)
SUSA# / GPO1 AA2 O Suspend Plane A Control (Rx94[2]=0). Asserted during
SPKR AF8CPU L: Enable CPU Frequency
power management POS, STR, and STD suspend states.
Frequency Strapping
Used to control the primary power plane. (10K PU to
StrappingH: Disable CPU Frequency
VSUS33 if not used)
Strapping (Default)
SUSB# / GPO2 AD3 O Suspend Plane B Control (Rx94[3]=0). Asserted during
KBCS# AF10Internal L: Disable internal KBC
power management STR and STD suspend states. Used to
KeyboardH: Enable internal KBC
control the secondary power plane. (10K PU to VSUS33
Controller (Default)
if not used)
SDCS1# AF25 Eliminate L: Enable. Use external
SUSC# AF2 O Suspend Plane C Control. Asserted during power
External EEPROM (Default)
management STD suspend state.
LAN H: Disable. Do not use
Used to control the tertiary power plane. Also connected to
EEPROM external EEPROM
ATX power-on circuitry. (10K PU to VSUS33 if not used)
105
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