Advantech MIC-3399, User Manual

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MIC-3399 User Manual 54
3.3 IPMI Interfaces
MIC-3399 provides three main IPMI messaging interfaces to connect to the BMC.
There is the IPMB-0 main messaging interface between CPCI boards, the LAN-side
band interface (NCSI), and the on-board payload interface to x86 (KCS).
Figure 3.1 Management Block Diagram
3.3.1 IPMB-0
IPMB-0 is the I2C-based PICMG 2.9 R1.0-defined main messaging interface
between CPCI boards. It consists of one I2C bus clocked at a frequency of 100 kHz,
using IPMI-compliant messaging.
3.3.2 KCS
The BMC KCS interface is implemented according to the IPMI 2.0 specification. Key -
board controller style (KCS) interfacing describes a legacy system interface based
around a bidirectional set of status/command and data register.
This type of interface has been adopted as the IPMI system interface and provides
the following benefits:

Higher bandwidth than that of I2C or RS-232-based interfaces

Robustness

Auto-discovery options