4.9 Power Management Interface Signals –Table 3
Name
Type
Description
PWROK
I
Power OK:
When asserted, PWROK is an indication to the
Ibex Peak that all of its core power rails have been stable for
10 ms. PWROK can be driven asynchronously. When
PWROK is negated, the Ibex Peak asserts PLTRST#.
NOTE:
It is required that the power rails associated with
PCI/PCIe typically the 3.3V, 5V, and 12V core well rails) have
been valid for 99ms prior to PCH_PWROK assertion in order
to comply with the 100ms PCI 2.3/PCIe 1.1 specification on
PLTRST# deassertion. PWROK must not glitch, even if
RSMRST# is low.
MEPWROK
I
Management Engine Power OK:
When asserted, indicates
that power to the ME subsystem is stable.
PWRBTN#
I
Power Button:
The Power Button will cause SMI# or SCI to
indicate a system request to go to a sleep state. If the system is
already in a sleep state, this signal will cause a wake event. If
PWRBTN# is pressed for more than 4 seconds, this will cause
an unconditional transition (power button override) to the S5
state. Override will occur even if the system is in the S1-S4
states. This signal has an internal pull-up resistor and has an
internal 16 ms de-bounce on the input.
RI#
I
Ring Indicate:
This signal is an input from a modem. It can be
enabled as a wake event, and this is preserved across power
failures.
