Filter
Top Products
System Management: IPMB Protocol
10009109-01 ATCA-9305 User’s Manual
7-5
IPMB PROTOCOL
The IPMB message protocol is designed to be robust and support many different physical
interfaces. The IPMC supports messages over the IPMB interface. Messages are defined as
either a request or a response, as indicated by the least significant bit in the Network Func-
tion Code of the message.
Table 7-3: Format for IPMI Request Message
• The first byte contains the responder’s Slave Address, rsSA.
• The second byte contains the Network Function Code, netFn, and the responder’s
Logical Unit Number, rsLUN.
• The third byte contains the two’s-complement checksum for the first two bytes.
• The fourth byte contains the requester’s Slave Address, rqSA.
• The fifth byte contains the requester’s Sequence Number, rqSeq, and requester’s Logical
Unit Number, rqLUN. The Sequence number may be used to associate a specific response
to a specific request.
• The sixth byte contains the Command Number.
Device-Specific (OEM) Codes 01-7E
01-7E Device specific (OEM) completion codes–command-specific codes (also specific for a
particular device and version). Interpretation of these codes requires prior knowledge of
the device command set.
Command-Specific Codes 80-BE
80-BE Standard command-specific codes–reserved for command-specific completion codes
(described in this chapter)
Byte: Bits:
76543210
1 rsSA
2 Network Function (netFn)
rsLUN
3Checksum
4
rqSA
5rqSeq
rqLUN
6Command
7:N Data
N+1 Checksum
Code: Description: (continued)