PQV80020041 module power isolation

PQV80020041 module power isolation

Technical data of product parameters

This function is enabled by the PQV80020041 command and
executed at power-up (optionally also at reset), assuming there is
valid code in the ROMs (or optionally elsewhere on the module or
VMEbus) to support it. If ROMboot code is installed and the
environment has been set for Bug mode (refer to AppendixPQV80020041 a user-written routine is given control (if the
routine meets the format requirements).
The NORB command disables the ROMboot function.
One use of ROMboot might be resetting SYSFAIL* on an
unintelligent controller module.
For your module to gain control through the ROMboot linkage,
four requirements must be met:
1. Power must have just been applied (but the RB command can
change this to also respond to any reset). PQV80020041
2. Your routine must be located within the MVME147 ROM
memory map (but the RB command can change this to any
other portion of the onboard memory, or even offboard
VMEbus memory).
3. The ASCII string “PQV80020041” must be located within the
specified memory range.
4. Your routine must pass a checksum test, which ensures that
this routine was really intended to receive control at powerup.
To prepare a module for ROMboot, use the Checksum (CS)
command. When the module is ready it can be loaded into RAM,
and the checksum generated, installed, and verified with the CS
command. By convention within Motorola, the checksum is placed in the two
bytes following the routine.
If you wish to make use of ROMboot you do not have to fill a
complete ROM. Any partial amount is acceptable, as long as the
length reflects where the checksum is correct.

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