ACE test Series Douts

Question

A 3 bit down counter is used to control the output of the multiplexer as shown in figure. The counter is initially at (101)₂ the output of multiplexer will follow the sequence:

A) I₁ --0--I₂ -- .........

B)  I₁-- I₁--0--I₂--..... 

C)  I₁--0--0--I₂--.......

D)  I₁--I₁--I₂--0--......

 

i confused with option A and Option D which is correct and why.?

if enable is 0 in case of multiplexer then what is output ? Does old output  not  available at output terminal like in case of sequential circuit ?

Comments

but in case of sequential  circuit old output is still present.

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but in case of sequential  circuit old output is still present.

yes.

Why this difference between Sequential and combinational?

in Sequential, we have memory ===> we stored the previous output

in Combinational, we don't have memory ==> we can't store the previous output

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thank u i got it.