sc3200 Advanced Micro Devices, sc3200 Datasheet - Page 81

• Manufacturer Part Number: sc3200
• Description: Geode-tm Sc3200 Processor
• Manufacturer: Advanced Micro Devices

Signal Definitions
3.4.15
AMD Geode™ SC3200 Processor Data Book
Signal Name
PWRBTN#
PWRCNT1
PWRCNT2
THRM#
Power Management Interface Signals (Continued)
EBGA
G31
E29
F31
F28
Ball No.
TEPBGA
AH5
AK6
AL7
AK4
Type
O
O
I
I
Description
Power Button. Input used by the power
management logic to monitor external sys-
tem events, most typically a system on/off
button or switch.
The signal has an internal pull-up of 100 KΩ,
a Schmitt-trigger input buffer and debounce
protection of at least 16 ms.
ACPI is non-functional and all ACPI outputs
are undefined when the power-up sequence
does not include using the power button.
SUSP# is an internal signal generated from
the ACPI block. Without an ACPI reset,
SUSP# can be permanently asserted. If the
USE_SUSP bit in CCR2 of GX1 module is
enabled (Index C2h[7] = 1), the CPU will
stop.
If ACPI functionality is desired, or the situa-
tion described above avoided, the power but-
ton must be toggled. This can be done
externally or internally. GPIO63 is internally
connected to PWRBTN#. To toggle the
power button with software, GPIO63 must be
programmed as an output using the normal
GPIO programming protocol (see Section
6.4.1.1 "GPIO Support Registers" on page
240). GPIO63 must be pulsed low for at least
16 ms and not more than 4 sec.
Asserting POR# has no effect on ACPI. If
POR# is asserted and ACPI was active prior
to POR#, then ACPI will remain active after
POR#. Therefore, BIOS must ensure that
ACPI is inactive before GPIO63 is pulsed
low.
Suspend Power Plane Control 1 and 2.
Control signal asserted during power man-
agement Suspend states. These signals are
open-drain outputs.
Thermal Event. Active low signal generated
by external hardware indicating that the sys-
tem temperature is too high.
Revision 5.1
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