Signal
Name
I/O
Type
Default
Mode
Ball
Coun
t
Default
Direction
and Logic
State
Power
Well
Internal/
External
Resistor Pull-
Up/Down
Description
to external Super I/O device. An internal
pull-up resistor is provided on these
signals.
If LDRQ1# interface is not used, this
signal can be used as a GPIO Port 23.
GPIO24
I/O
GPO
1
O (Low)
SUS
General Purpose I/O Port 24. Not
Multiplexed
GPIO25
I/O
Native
1
I
SUS
General Purpose I/O Port 25. Not
Multiplexed
3
GPIO26
I/O
Native
1
I
SUS
General Purpose I/O Port 26. Not
Multiplexed
3
GPIO27
I/O
GPO
1
O (Low)
SUS
General Purpose I/O Port 27. Not
Multiplexed
GPIO28
I/O
GPI
1
I
SUS
General Purpose I/O Port 28. Not
Multiplexed
GPIO30
I/O
GPI
1
I
SUS
Internal pull-down
General Purpose I/O Port 30. Not
Multiplexed
GPIO31
5
I/O
GPI
1
I
SUS
General Purpose I/O Port 31. Not
Multiplexed
GPIO32
4
I/O
Native
1
O (High)
CORE
General Purpose I/O Port 32. Not
Multiplexed
3
GPIO33
4
I/O
GPO
1
O (High)
CORE
Weak internal
pull-up
General Purpose I/O Port 33. Not
Multiplexed
Flash Descriptor Security Overwrite. This
signal is used to set the security override
strap on the PCH. If sampled low, the
Flash Descriptor Security will be
overridden. If high, the security
measures defined in the Flash Descriptor
will be in effect. This strap should only be
enabled (pulled low) in manufacturing
environments using an external pull-
down resistor.
GPIO33
0 Enable (Pull-Down Required)
1 Disable (Default)
When the Security Overwrite is enabled,
it allows permission to every master to
read and write to the entire Flash
Components including areas outside the
defined regions.
GPIO34
I/O
GPI
1
I
CORE
General Purpose I/O Port 34. Not
Multiplexed
GPIO35
I/O
GPO
1
O (Low)
CORE
General Purpose I/O Port 35. Not
Multiplexed
GPIO36
I/O
GPI
1
I
CORE
General Purpose I/O Port 36. Not
Multiplexed
ADR/
GPIO37
I/O
GPI
1
I
CORE
General Purpose I/O Port 37. Can be
used for ADR (Asynchronous DRAM
Refresh) trigger on platform. Only
supported if processor supports ADR.
HARDWARE activation mechanism that
continued...
Technical Reference—Crystal Forest
Intel
®
Xeon
®
Processor E3-1125C with Intel
®
Communications Chipset 8910 Development Kit
October 2012
User Guide
Order No.: 328009-001US
47