Intel C2518 FH8065501516710 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 2 of 3

September 2014

500

Order Number: 330061-002US

The signal description table has the following headings:

• Signal Name: The name of the signal/pin
• Direction: The buffer direction is either input, output, or I/O (bi-directional)
• Type: The buffer type
• Description: A brief explanation of the signal function

Only 3.3V LPC devices are supported on the LPC interface.

I/O

 Internal pull-ups are 

provided for these signals.
The LPC_AD[3:0] signals are muxed with GPIOS[24:21] and are used by 

O

A 25-MHz PCI-like clock driven to LPC peripherals.

I/OD

 Input to determine the status of LPC_CLK and an 

open-drain output is used to request starting or speeding up LPC_CLK. 

This is a sustained tri-state signal used by the central resource to request 

permission to stop or slow LPC_CLK. The central resource maintains the 

signal in the asserted state when LPC_CLK is running and deasserts the 

signal to request permission to stop or slow LPC_CLK.
An external pull-up resistor, 20 kΩ suggested, tied to 3.3V is required.
This signal is muxed with GPIOS[28] and is used by other functions.

O

This signal indicates the start of an LPC cycle or an abort.

I/O

This signal implements the serial interrupt 

protocol. See 

 for additional 

information about this pin.
This signal is muxed with GPIOS[29] and is used by other functions.

O

PMU

 This active-low output signal indicates that the platform is 

entering a low-power state (S5) soon. When that happens, the SoC needs 

to operate from the Suspend (SUS) power well only.
This signal is used as the LPC Power Down (LPCPD#) signal sent to LPC 

devices that need the LPCPD# input. LPCPD# is monitored by LPC 

devices with memory that needs to switch from normal refresh mode to 

suspend refresh mode. It is also used by other peripherals as an 

indication that they isolate their outputs that are powered by voltage 

planes that are soon powered-off.
This is going to powered-off planes.
This signal is muxed with GPIO_SUS[10] and is used by other functions.