Lcm Control Complex Cards - Nortel DMS-100 Series Maintenance Manual

LCM control complex cards

The LCM processor (LCMP) card and di-group control card (DCC) are
often referred to as common cards in the LCA. In each LCA, the common
cards, which are always provided. The following paragraphs describe the
functions of these cards.
LCM processor card
The LCMP, NT6X51BA, located in slot 04 of each LCA shelf, has three
Motorola 68302 processors running at 16.67 megahertz (MHz) each and
additional resources, which are tightly coupled. The tasks required of the
LCM processor pack are distributed among the different processors. The
following figure, "NT6X51BA functional block diagram," shows the
following processors and their resources:
main processor (MP)
control side (C-side) processor (CP)
peripheral side (P-side) processor (PP)
miscellaneous hardware resources
faceplate hardware resources
MP circuit resources The main processor is the controlling processor for
the NT6X51BA card. Under normal operating conditions, it directly
controls the LCMP activity signals, DCC timeswitch and connection
memories, operation of the inter-unit communication (IUC) serial link to the
mate processor, and for interfacing the debug monitor serial port. The
non-volatile flash ROM space holds all executable code for the MP and reset
code for the CP and PP processors. Two banks of flash ROM of 4
megabytes (4M) each are provided so the MP can actively execute code
from one bank while updating the code space in the mate or standby (STBY)
bank. Switch of activity between the two banks is implemented using a
deterministic protocol implemented in hardware and software. The MP is
the first processor released for operation after hardware reset and is
responsible for configuring the other two processors (CP and PP) before
releasing them to run. Each processor runs asynchronously and
independently of the other two processors for maximum computing
efficiency.
When a new software load is sent to the RLCM-EDC processor by the
computing module (CM) the RLCM-EDC unit can remain in-service (InSv),
executing code from the active bank, while the new load is being written
into the STBY bank.
DMS-100 Family Maintenance Manual ABSK007
Maintenance overview 1-7