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Whats the difference between priority and normal encoders?

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Haytham-Sief

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Encoders

What is the diffrence between the priority Encoder and the normal encoder ? Plzz if any one can reply I will be thankfull. Also give me the number of an encoder without priority.
Thnx
 

Re: Encoders

Haytham-Sief said:
What is the diffrence between the priority Encoder and the normal encoder ? Plzz if any one can reply I will be thankfull. Also give me the number of an encoder without priority.
Thnx
Click to expand...

Normal encoder gives equal priority to all inputs ..while priority encoder checks gives prirority to some inputs over others ... for example..
if (cond [0] == 1)
{
q <= 1;
}
else if (cond [1] == 1)
{
q <= cond [1];
}
else
{
q <= 0 ;
}
The h/w equailvalent will be such that cond[0] if top priority ..if it is one then it does not matter if cond[1] is 0 or 1 ... the implementation is usally in a layered mux condition.
 
Encoders

When you want to implement a priority encoder in VHDL/Verilog you use the if-else statement. The higher the priority the lower the delay. For normal encoders you use the case statement.
 
Re: Encoders

Thanx very much for ur help but plzzz I need more explaination , I'm not using VHDL I'm using hardware without controling I mean I cant conrol the priority of the encoder. Thnx alot
 

Re: Encoders

If you are using schematics then I uploaded you two pictures of a priority and a normal encoder examples.
In priority encoder x2 has the highest priority while x0 has the lowest one.
In parallel all have the same priority.
Hope it helps
 
Re: Encoders

It is very useful. Thanks for your sharing.
 

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