What is nibble multiplexer?
A byte always contains 8 bit of information(A7, A6 ....A0) . In
case you want to use only 4 bits (16 combination) of data then 2
such information can be stored/transmitted through 1 byte, so to
select weather your useful data is A0, A1, A2, A3 or A4, A5, A6, A7
a nibble MUX can be used.For detailed help reply me at