ZiLOG eZ80F91 User Manual page 56

eZ80F91 Development Kit
User Manual
46
Functional Description
7.5 ns = 26.3 ns. Refer to the External Memory Write Timing diagram in
the eZ80F91 Product Specification (PS0192) for assistance.
With the addition of a Fast buffer, Flash turn-off time is reduced from
25 ns to 5.5 ns. Bus contention can still occur, but the amount of time it
consumes is not T
CON
7.5 ns + 5.5 ns) = 6.8 ns. At this faster rate, data that is being written does
not become corrupted because the write pulse is not yet asserted.
As of the date of publication of this document, ZiLOG has not completed
an analysis of the effect that this 6.8 ns period of bus contention has on the
design. An Application Note from
SRAM and Bus Contention further explains this bus contention issue.
= 26.3 ns but rather T
Cypress Semiconductor
PRELIMINARY
= (8.8 ns –
CON
titled NoBL
UM014210-1003