Can *C9572 Design Tri state

[J_expoler2]

*c9572 design tristate

I can't design design Tri State on *c9572 it show worning . does it support Tri state
BR.

 

[Romanp]

3 state is possible only externally on I/Os.

 

[maestor]

As J_expoler2 said just be careful with your 3-state buffers they are only in your I/Os so sometimes your synthesizer does not infer them in your I/Os by default.

What synthesis tool are you using? In Leonardo you can (although I thing is a default)

'set bubble_tristate TRUE'

and I thing Synplify does it by default

no idea about XST or others.

You can also fix it in your RTL moving all your bi-directional tri-stated signals to the TOP level.

Regards,
Maestor