Intel SE7520JR2 5.3.17.5LAN Interface

Intel® Server Board SE7520JR2 Platform Management

•SMBus data signal (SDAH)

•Optional SMBus alert signal (SMBAH). The signal notifies the host that the PC87431x has data to provide.

When the system main power is off (PWRGD signal is low), the host interface signals are in TRI-STATE to perform “passive” bus isolation between the mBMC SCLH, SDAH and SMBAH signals and the SMBus controller signals. The passive bus isolation can be disabled by host SMBus isolation control (offset 05h;) to support various system designs.

The mBMC is a slave device on the bus. The host interface is designed to support polled operations. Host applications can optionally handle an SMBus alert interrupt, in case the mBMC is unable to respond immediately to a host request. In this case, “Not Ready” is indicated in one of two ways:

•The host interface bandwidth is limited by the bus clock and mBMC latency. To meet the device latency, the mBMC slows the bus periodically by extending the SMBus clock low interval (SCLH). It is recommended to have a point-to-point connection between the host and mBMC.

•If the mBMC is in the middle of a LAN or peripheral device communication, or if a response to the host request is not yet ready, the mBMC does not acknowledge the device address (“NACK”). This forces the host software to stop and restart the session. The minimum interval between two sessions should be 500 microseconds.

5.3.17.5LAN Interface

The IPMI Specification v1.5 defines how IPMI messages, encapsulated in RMCP packet format, can be sent to and from the mBMC. This capability allows a remote console application to access the mBMC and perform the following operations:

•Chassis Control, e.g., get chassis status, reset chassis, power-up chassis, power-down chassis

•Get system sensor status

•Get and set system boot options

•Get Field Replaceable Unit (FRU) information

•Get System Event Log (SEL) entries

•Get Sensor Data Records (SDR)

•Set Platform Event Filtering (PEF)

•Set LAN configurations

In addition, the mBMC supports LAN alerting in the form of SNMP traps that conform to the IPMI Platform Event Trap (PET) format.

Table 53: LAN Channel Capacity

LAN Channel Capability	Options
Number of Sessions	1
Number of Users	1
User	Name NULL (anonymous)
User Password	Configurable

Revision 1.0	135
	C78844-002