431RAM, Address and Data Buses, Memory Decoding, Semiconductor Memories
6.Flash Memory: Flash is electrically erasable one sector at a time. A sector is erasable
by writing 1s at the addressed sector. Writing of the byte required at a given address
programs the initialy erased flash address.
EXAMPLES
Design a 4-Bit buffer register with tristate outputs.
Solution
We replace the AND gates in the circuit of Figure 16.2(a) by the tristate buffers and these are
put before the register outputs and the internal Qs. An out-enable input (can be called read
input) upon its activation releases Qs at the register outputs from third states. Figure 17.3(a)
upper ...
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