Intel MPRTM0020 ユーザーズマニュアル

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This section describes the management support for a non-intelligent Rear Transition Module 
(RTM) such as the MPRTM0020. A non-intelligent RTM FRU does not have a controller on board 
to communicate with the SBC IPMC. Instead, all of the non-intelligent RTM sensors and the non-
intelligent RTM FRU storage device are connected directly to the SBC IPMC. This is usually done 
via dummy I

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C sensor and storage devices. It is the responsibility of the SBC IPMC to make the 

non-intelligent RTM look like a separate intelligent FRU controller to the rest of the system.

The feature that is not supported for RTMs is E-keying, since there are no PICMG requirements 
defined for non-intelligent RTMs. 

Since the non-intelligent RTM does not have a payload, the SBC IPMC only needs to implement 
the Cold Reset version of the FRU control command. This command does not cause the IPMC to 
reset. Instead the command causes all of the sensor and state information for the non-intelligent 
RTM to be set back to startup values, simulating a controller reset.

The SBC IPMC is responsible for implementing the M-State machine for the non-intelligent RTM. 
From the perspective of the Shelf Manager the non-intelligent RTM looks like a separate managed 
FRU device with its own M-state that is separate from that of the IPMC. In order to do this, the 
IPMC sends M-State transition messages to the Shelf Manager, accepts activation/deactivation 
requests from the Shelf Manager, and negotiates power budgeting as if it were a separate RTM 
controller. 

The non-intelligent RTM is not intended to be hot-swapped in or out of the system. For this reason 
the handle switch on the non-intelligent RTM is combined with the handle switch on the SBC. If 
either handle switch is opened, both the non-intelligent RTM and the SBC will take the appropriate 
action for removal. 

When the SBC is inserted into the system the non-intelligent RTM is initialized to M0 state. The 
SBC IPMC then checks for the presence of the non-intelligent RTM. If the non-intelligent RTM is 
present then the non-intelligent RTM M-State is set to M1. In the M1 state the SDR records in the 
non-intelligent RTM FRU device are incorporated with the IPMC SDR records. The non-
intelligent RTM then remains in M1 until the SBC IPMC reaches M4. At that point the non-
intelligent RTM transitions to M2 and waits for activation from the Shelf Manager. Once the Shelf 
Manager activates the non-intelligent RTM, the non-intelligent RTM transitions to M3 and waits 
for its power budget to be granted. Once the power budget is granted the non-intelligent RTM 
transitions to M4 and stays there until a deactivation is received from the Shelf Manager or a 
handle switch is opened.