RCIM User’s Guide
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The “not synchronized” and “unsynchronized” messages indicate that the cable is not
answering attempts to communicate. These messages will occur when the optical cable is
installed or removed. They will also occur when a connected system is powered off.
The last two messages indicate transient errors such as cable parity errors or temporary
loss of cable synchronization. If a transient error occurs, it may require a link in the cable
to resynchronize. If a distributed interrupt is being broadcast on the cable, it may be lost.
Transient errors also affect the synchronization of the tick timers since the cable clock will
not reach all of the systems. Refer to Chapter 3 for instructions for synchronizing clocks.
Connection Modes
1
When RCIM boards of various systems are chained together, an interrupt can be
simultaneously distributed to all connected RCIMs, and from the RCIMs to all the
associated host systems.
NOTE
RCIMs in a chain can all be the same model, or they can be a mix
of RCIM III and RCIM IV boards.
If your system will be part of an RCIM chain, it is best to determine the desired connection
mode before installing an RCIM; it is easier to connect the optical cable to the cable
connectors before the RCIM is installed.
Note that to reconfigure an RCIM chain, the systems must be powered off and rebooted
after moving the cables. The driver determines if a system is the master RCIM at boot time
and configures the master system to control the cable clock and its enable. Swapping the
cables without rebooting the systems will result in problems with the cable clock.
An RCIM can be connected in one of the following modes:
Isolated mode
There are no connections to any other RCIM.
Master mode
The RCIM is at the head of a chain of RCIMs. There is no cable
connection going into this RCIM, only a cable connection going out.
The RCIM master is unique in that it controls the clocks (see
Chapter 3 for a discussion).
Pass-through
The RCIM is connected to two other RCIMs. There is an input
Slave mode
cable connection coming from the previous RCIM in the chain, and
an output cable connection going to the next RCIM in the chain.
Final Slave mode
The RCIM is connected to one other RCIM. There is an input cable
connection going into a final slave RCIM but no output cable
connection coming out of it.
Summary of Contents for RCIM
Page 1: ...Real Time Clock and Interrupt Module RCIM User s Guide 0898007 1000 March 2021...
Page 10: ...RCIM User s Guide 1 4...
Page 32: ...RCIM User s Guide 2 22...
Page 80: ...RCIM User s Guide A 28...
Page 102: ...RCIM User s Guide C 2...
