RSTOL and flash memory timing

Gentlemen -

For those of you designing platforms around the DS87C400 CPU:

I am having a problem with a '400 CPU and an AMD flash memory. I
connected the flash device hardware /RESET line to the /RSTOL on the
CPU. Sounds good, right? Problem is, the flash requires some time after
reset before it may be read (about 50us), and the CPU starts reading
flash looking for user code pretty soon after reset ends. I am not
entirely sure yet, but I think this may be a problem! 

Of course, others have had trouble when connecting the PHY reset to this
pin because the PHY has to be running before the CPU comes out of reset.

Beware using the '400 /RSTOL pin unless you are sure the peripheral can
be ready for access in time!

Chris Fox

BTW: I still have four new TINI 72 PIN 1M SIMMs for sale, now marked
down to $50 each. Write me off-list of you are interested at
[email protected]


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