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Chapter 3
Input Modules
If the upgrade procedure of the currently used revision fails because of unexpected power
failure, brownout or system instability whilst the upgrade was in progress, the CPU will
automatically revert to the 'known-good-working' revision, next time the FPGAs get
reloaded. The last 'known-good-working' revision becomes the new 'golden' revision,
which must not be overwritten next time a firmware upgrade is initiated. This 'ping-pong'
upgrade scheme guarantees that there is always an uncorrupted and working image of the
FPGA bitfile stored in Flash Memory.
The modules maintain a backup image of the last working firmware at all times. In the
event of an upgrade failure, the module will revert back to its backup image to maintain
operation on the board. You can verify the version that is current running on the module by
looking at the version parameters:
Processing FPGA
version.
If Software Version shows 0.0, this means that the module is in failsafe mode
Software
Version,
Control FPGA version
and
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