Registering Block Outputs

[Avighna]

Why should the outputs be registered always?

It says that we have to make sure that registers drive the block outputs . Could anyone please explain me why ?

 

[popzhou]

Basic speaking, if non-registered ouput used as inputs to other blocks, the top level DC synthesis optimization will not very effecient. hope it will help you.

 

[skyfaye]

Registering outputs makes your timing closure a little easier. You should have a better chance of meeting timing if the registered output from one module is not eating into the timing budget of the next module.

- Hung