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Thanks to your help, I have cleared most of my doubts regarding VPD,
however there are a few doubts which still remain. I would really
appreciate any advice on these.
You are familiar with the procedure to read and write the VPD data.
Supposing Software is reading the data, it writes the VPD address (how
does it know this address i.e. what to write in the VPD address register
????) and sets the flag to zero.
hardware fetches the data places it in the VPD data reg, then it sets
the flag to one.
software will see this flag as one, then read the data.
my doubt is after this what happens to the flag ?? will it remain one
and if it does, will the hardware on seeing this one assume that now the
software wants to write VPD data ? Will this not lead to some amount of
..... in life, there is more imagination
than in all our dreams .....