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Question 10.6: A 1 Mbit flash memory, organised as 128 K by 8 bits, has a b...

A 1 Mbit flash memory, organised as 128 K by 8 bits, has a byte write time of 10μs, a flash erase time of 10ms and a verify time of 6 μs. Calculate the total length of time for a complete memory write and then a complete erase.

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To write a byte of data takes 10μs but each byte should be verified and so the total write time per byte is 16μs. Hence the total write time for the array is:
128×10^{3}×16×10^{-6}= 2.048 seconds.

To completely erase we must first prewrite all bytes with a logic 0, then erase and finally perform an erase verify. The total erase time is thus:

T_{erase}=2.048+10ms+128×10^{3}×6μs

=2.048+0.01+0.768

=2.826 seconds

 

 

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