Microprocessors - Avaya Nortel Communication Server 1000 Reference

• Sanity timer
• Bus timer

Microprocessors

One microprocessor handles data transfer between each serial interface and software, reports
the status of each port and takes commands from the software to control the activities of the
ports. A high performance MPU supports the D-channel from the PRI card and other software
applications running simultaneously on other ports of the DDCH card.
The microprocessor performs the following functions:
• sanity check and self tests
• message handling between the CS 1000E, CS 1000M Cabinet, and Meridian 1 PBX 11C
Cabinetand the card
• four port serial communication controller handling with Direct Memory Access (DMA)
• program download from the Small System Controller
Main memory
The main 68EC020 system memory is comprised of 1 Mbyte of SRAM and is accessible in 8
or 16 bits. The software, base code and application reside in main RAM and is downloaded
from the software through the shared memory.
Shared memory
The shared memory is the interface between the CPU and the 68EC020 MPU. This memory
is a 16 Kbyte RAM, expandable to 64 kbytes and accessible in 8 or 16 bits.
EPROM memory
The Bootstrap code resides in this 27C1000 EPROM and is executed on power up or reset.
Flash EPROM memory
Flash EPROM provides non-volatile storage for the DDCH loadware which minimizes the
impact to sysload. The Flash EPROM provides an increase in system service with a reduced
delay after a brown-out, and faster testing of a hardware pack after it is plugged in.
Circuit Card Reference
Functional description
July 2011 563