Nortel Communication Server 100 Manual page 28

28 Carrier Remote IPE product description
Figure 6
Local Carrier Interface card functional block diagram
Micro Processing Unit
The Micro Processing Unit (MPU) coordinates and controls data transfer
and addressing of the peripheral devices and communicates with the
system CPU using a message channel on the CPU bus. The tasks that the
MPU performs depend on the interrupts it receives. These interrupts are
prioritized by the importance of the tasks they control.
The MPU is highly integrated and provides most of the decision-making
logic on the chip. Functions of the MPU include controllers, timers, control
and arbitration logic, address decoding, dual-port RAM and independent
direct memory access, input/output ports, and independent full-duplex
serial communication channels that support various protocols.
The MPU can be reset by:
•
powering up the Local Carrier Interface card
•
the watchdog timer
•
the ENB/DIS switch
•
the system CPU command
Nortel Communication Server 1000
Carrier Remote IPE Fundamentals
NN43021-555 04.01 4 June 2010
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