how do I build a 3*8 priority encoder from 4*2 priority encoder?

 

hi R,
Welcome to AAC,
As this is a Colleges assignment we need to see your attempt at solving the problem, we can then guide you.
E

 

the problem is that I have to build a priority 4*16 encoder in a recursive way, I used "divide and conquer "to my problems into subproblems,
such I made the priority 2*4 encoder and ill do 3*8 then ill combine 3*8 into 16*4, but I'm struggling at doing the 3*8 but I know that I have to use 2*4 priority
encoder

 

hi,
You should find this link and PDF helpful, read through them and post any queries.
E
https://www.technobyte.org/encoders-decoders-priority-encoders/

 

the problem is that I have to build a priority 4*16 encoder in a recursive way, I used "divide and conquer "to my problems into subproblems, such I made the priority 2*4 encoder and ill do 3*8 then ill combine 3*8 into 16*4, but I'm struggling at doing the 3*8 but I know that I have to use 2*4 priority encoder

In a recursive way ?

The logic for a "Recursive Implementation of a Priority Encoder" can be found here ...
https://www.beyond-circuits.com/wordpress/2009/01/recursive-modules/

It appears that...
A 16:4 Priority Encoder can be built from 2 x 8:3 Priority Encoders
A 8:3 Priority Encoder can be built from 2 x 4:2 Priority Encoders
A 4:2 Priority Encoder can be built from 2 x 2-Bit Priority Encoders

A 2-Bit Priority Encoder is just an OR Gate.
Finally, add some gates to "glue" it all together ...