Hey,
Just revising for a hardware exam, looking over some past papers and a few questions I can't answer
How can I make a four way multiplexer using three 2 input multiplexers
I thought I would do something like this
but that leaves me with 3 Selector lines, when really I only want 2...
Can anybody suggest anything?
Also on a side note, I've been asked to "show how four four-way multiplxeres can be used to build a four bit shifer with inputs I3,I2,I1 and I0 and outputs O3,O2,O1 and O0"
Can it be done JUST with four four-way multiplexers.. or do you need to use D-Q flip flops as well.. I always thought any shifter required D-Q flip flops, yet the question doesn't mention them.
Thanks for any help
Just revising for a hardware exam, looking over some past papers and a few questions I can't answer
How can I make a four way multiplexer using three 2 input multiplexers
I thought I would do something like this
Code:
A------|1|___| |
B------|_| |2|___| |
C------------|_| |3|-------O
D------------------| |
but that leaves me with 3 Selector lines, when really I only want 2...
Can anybody suggest anything?
Also on a side note, I've been asked to "show how four four-way multiplxeres can be used to build a four bit shifer with inputs I3,I2,I1 and I0 and outputs O3,O2,O1 and O0"
Can it be done JUST with four four-way multiplexers.. or do you need to use D-Q flip flops as well.. I always thought any shifter required D-Q flip flops, yet the question doesn't mention them.
Thanks for any help