RTM Management Architecture | |
RTM Management Architecture | 5 |
5.1Introduction
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 I2C 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.
5.2RTM FRU Control
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.
5.3M-state Machine
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.
30 | Intel NetStructure® MPRTM0020 Technical Product Specification – April 2006 |