AMD SC3200 manual Power Management Interface Signals, KHz Output Clock

32581C Signal Definitions

3.4.15Power Management Interface Signals

Signal Name	Ball No.	Type	Description	Mux
CLK32	AH8	O	32.768 KHz Output Clock	---
GPWIO0	AH6	I/O	General Purpose Wakeup I/Os. These signals each	---
			have an internal pull-up of 100 KΩ.
GPWIO1	AK5			---
GPWIO2	AJ6			---
LED#	AL4	O	LED Control. Drives an externally connected LED (on,	---
			off or a 1 Hz blink). Sleeping / Working indicator. This sig-
			nal is an open-drain output.
ONCTL#	AJ5	O	On / Off Control. This signal indicates to the main power	---
			supply that power should be turned on. This signal is an
			open-drain output.
PWRBTN#	AH5	I	Power Button. Input used by the power management	---
			logic to monitor external system 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 unde-
			fined when the power-up sequence does not include
			using the power button. SUSP# is an internal signal gen-
			erated 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 situation described
			above avoided, the power button 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 Sec-
			tion 6.4.1.1 "GPIO Support Registers" on page 222).
			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	AK6	O	Suspend Power Plane Control 1 and 2. Control signal	---
			asserted during power management Suspend states.
PWRCNT2	AL7	O		---
			These signals are open-drain outputs.
THRM#	AK4	I	Thermal Event. Active low signal generated by external	---
			hardware indicating that the system temperature is too
			high.

64 AMD Geode™ SC3200 Processor Data Book