Intel C2518 FH8065501516710 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 2 of 3

September 2014

430

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

The optional SMBus 2.0 signal, SMBSUS#, is not supported.

At its network layer, the System Management Bus Specification refers to three types of 

devices:

• Slave Device - A device that is receiving or responding to a command.
• Master - A device that issues commands, generates the clocks, and terminates the 

transfer.

• Host - A specialized master that provides the main interface to the system CPU. A 

host must be a master-slave and must support the SMBus host notify protocol. At 

most, one host exists in a system.

The SMBus controller described in this chapter is a system host. It is an example of an 

SMBus device that acts as a host most of the time but that includes some slave-device 

behavior.

The programming model of the host controller is combined into two portions: a PCI 

configuration portion and a system I/O mapped portion. All static configurations, such 

as the I/O base address, is done using the PCI configuration space. Real-time 

programming of the host interface is done in the system I/O space.

The SMBus interface is disabled by setting FUNC_DIS_2.SMB_DIS to 1b.

I/OD

I/OD

I/OD

 This signal wakes the system or 

generates a System Management Interrupt (SMI).
This signal is muxed with GPIOS_10 and is used by other functions.