SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 74

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

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Signal Definitions
2.4.15 Power Management Interface Signals
Signal Name
CLK32
GPWIO0
GPWIO1
GPWIO2
LED#
ONCTL#
PWRBTN#
PWRCNT1
PWRCNT2
THRM#
EBGA
G28
G29
G31
H29
E31
D31
E30
E29
F31
F28
(Continued)
Ball No.
TEPBGA
AH8
AH6
AH5
AK5
AK6
AK4
AJ6
AL4
AJ5
AL7
Type
I/O
O
O
O
O
O
I
I
Description
32.768 KHz Output Clock
General Purpose Wakeup I/Os. These sig-
nals each have an internal pull-up of 100 K .
LED Control. Drives an externally connected
LED (on, off or a 1 Hz blink). Sleeping /
Working indicator. This signal is an open-
drain output.
On / Off Control. This signal indicates to the
main power supply that power should be
turned on. This signal is an open-drain out-
put.
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 ,
a Schmitt-trigger input buffer and debounce
protection of at least 16 ms.
ACPI is non-functional when the power-up
sequence does not include using the power
button. If ACPI functionality is desired, the
power button must be toggled. This can be
done externally or internally. GPIO63 is inter-
nally 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
5.4.1.1 "GPIO Support Registers" on page
231). GPIO63 must be pulsed low for at least
16 msec 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.
74
Mux
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