4.27 General Purpose I/O Signals
NOTES:
1.
All GPIOs can be configured as either input or output.
2.
GPI[15:0] can be configured to cause a SMI# or SCI. Note that a GPI can be routed to either an
SMI# or an SCI, but not both.
3.
Some GPIOs exist in the VccSus3_3 power plane. Care must be taken to make sure GPIO signals
are not driven high into powered-down planes. Also, external devices should not be driving
powered down GPIOs high. Some GPIOs may be connected to pins on devices that exist in the core
well. If these GPIOs are outputs, there is a danger that a loss of core power (PWROK low) or a
Power Button Override event will result in the Ibex Peak driving a pin to a logic 1 to another device
that is powered down.
4.
The functionality that is multiplexed with the GPIO may not be utilized in desktop configuration.
5.
When this signal is configured as GPO the output stage is an open drain.
6.
GPIO18’s blink capability defaults to enabled; therefore, it will toggle at a frequency of
approximately 1 Hz when the Ibex Peak comes out of reset.
7.
In a ME disabled system, GPIO31 may be used as ACPRESENT from the EC.
8.
GPIO18 will toggle at a frequency of approximately 1 Hz when the Ibex Peak comes out of reset
