Motorola CPCI-6115 Manuel de service Page 32

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CPX8216 and CPX8216T Installation and Use (6806800A52C)
Chapter 2 System Architecture
12
CPU Complex Architecture
The CPU complex in the CPX8216 contains two CPU modules and their corresponding Hot
Swap Controller (HSC) modules. The figure below illustrates the architecture, including
elements on the boards as well as local connections between the CPU modules and the PCI-
to-PCI (P2P) connections to the local CompactPCI buses.
The CPU Module
In addition to the processor, RAM, etc., each CPU module contains:
Up to two Ethernet controllers
Up to two serial communications links
P2P bridge to the local CompactPCI bus
Local PCI Bus connection to the HSC
Switching Service to the Passive CPU
The switchover from one CPU to another is initiated by the passive CPU when there is an
indication that there is something wrong with the active CPU, such as a failed heartbeat
protocol. The passive side notifies the active side that it is about to begin a switchover process.
If the active side agrees to the switchover, then the two sides coordinate the hand-off and no
bus signals, clocks, or devices should be corrupted. Bus signals, clocks, and devices attached
to the bus may be corrupted if the active system fails to cooperate with the takeover attempt.
In a more extreme takeover, it is possible for the passive CPU to power-on reset the active CPU
and to take control that way.
HSC
P2P
RAM
Enet
ISA
IDE
Proc
P2P
HSC
P2P
RAM
Enet
ISA
IDE
Proc
P2P
Local Connections between CPU Modules
CompactPCI BusCompactPCI Bus
Link
Serial
Link
Serial
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