6 interfacing with the environment, 1 rtm (rear transition module), 1 standard compliance – Kontron AT8940 User Manual
Page 22: 2 hot swap, 1 inserting the rtm into the slot, 2 removing the rtm from the slot, Rtm (rear transition module)
Product Description
7
www.kontron.com
1.6
Interfacing with the Environment
1.6.1
RTM (rear transition module)
The RTM is a single slot (6HP) AdvancedTCA Rear Transition Module. This module provides additional
connectivity for AT8940 CPU front blade.
1.6.1.1
Standard Compliance
• PICMG® 3.0 R3.0 Advance TCA™ base specification
• PICMG® 3.1 R2.0 Advance TCA™ Ethernet specification
1.6.1.2
Hot Swap
The RTM supports hot swapping by using the switch connected to the face plate lower ejector. This switch
indicates the coming hot swap action. The insertion of the RTM to a slot is always done over a non powered
connector. During the extraction procedure, the management power is disabled only when the RTM is
removed. This procedure meets the AdvancedTCA AMC behavior.
1.6.1.2.1
Inserting the RTM into the slot
The presence of the RTM is indicated by one signal. The front blade IPMC recognizes the RTM insertion when
the signal is low. After recognizing the RTM, the IPMC turns the blue LED ON and enables the management
power to the RTM. Once the IPMB-L link is working, the IPMC accesses the MMC to retrieve FRU data. After
knowing the type of RTM inserted, the IPMC negotiates with the shelf manager in order to activate the +12V
payload power. After RTM local voltages have been ramped up, the RTM’s MMC enables the RTM Link.
After this the front board IPMC informs the shelf manager there is a functional RTM blade present.
1.6.1.2.2
Removing the RTM from the slot
The RTM_EJECT signal goes HIGH by opening the RTM lower ejector handle. This indicates to the front blade
IPMC that a hot swap action is going to take place. The IPMC then negotiates the removal with the System
manager and if it is granted, it proceeds with the removal process.
The IPMC proceeds to the deactivation by disabling ekey governed links, the IPMC then disables the RTM Link
and turns OFF the payload +12V power. When it is safe to remove the RTM blade from the slot, the IPMC turns
the Blue / Hot Swap LED ON. Front Blade IPMC turns OFF the management power only when there is no RTM
detected. (RTM removed from the slot)