SC3200 datasheet(81/447 Pages) AMD

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AMD Geode™ SC3200 Processor Data Book

Signal Definitions

Revision 5.1

PWRBTN#

E29

AH5

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 K

Ω,

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.

---

PWRCNT1

F31

AK6

Suspend Power Plane Control 1 and 2.

Control signal asserted during power man-

agement Suspend states. These signals are

open-drain outputs.

---

PWRCNT2

G31

AL7

---

THRM#

F28

AK4

Thermal Event. Active low signal generated

by external hardware indicating that the sys-

tem temperature is too high.

---

3.4.15

Power Management Interface Signals (Continued)

Signal Name

Ball No.

Type

Description

Mux

EBGA

TEPBGA

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