D20MX HARDWARE USER’S MANUAL GE INFORMATION 101
D20MX Processor
Appendix C: Frequently Asked
Questions
Frequently Asked Qu estions
This appendix answers some frequently and commonly asked D20MX questions.
Questions and answers
Q: Why is a D20MX RTU important?
A: The D20MX is being introduced for the following reasons:
– Some electronic components used in the D20 products have reached their end-
of-life; For example, the 68EC030 CPU in the D20ME II and D20ME boards.
– VXworks is the new operating system for the D20MX; this is more robust for D20
applications.
– The D20MX offers Cyber Security features that are intended for critical
infrastructure protection within the power system. This is required for Electric
Reliability Compliance.
– The D20MX is a modern platform that is capable of handling current and future
processing needs, particularly for security.
– The D20MX has 1 GB of RAM, compared to 1 MB RAM in the D20ME.
– The D20MX has 16 MB of built-in NVRAM, compared to the 512 KB of NVRAM
available in its predecessor. Subsequently, there is no need for additional memory
expansion modules.
– The firmware flash memory size in the D20MX is 128 MB, compared to the 2 MB of
its predecessor.
– The D20MX uses a Super Capacitor which allows the system clock to be saved for
14-days even after power off.
Q: How does configuration storage work in the D20MX?
A: The Super capacitor strictly allows the retention of the system clock time for 14-days.
At power-up, the configuration resides in the RAM. At power-down, configuration
resides in the flash. This is possible due to the seamless transaction between the RAM
and flash. This arrangement protects the D20MX configuration from being lost, even
after power-down for an indefinite period of time.
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