How to prevent MAP from removing floating inputs?

[Kelvin]

Hi, there:

I remembered there was a constraint that can prevent MAP from
removing floating input pins? What is it?

Thanks.
Kelvin

 

[Allan Herriman]

On Thu, 1 Jul 2004 17:06:37 +0800, "Kelvin" <student@nowhere.com>
wrote:

Hi, there:

I remembered there was a constraint that can prevent MAP from
removing floating input pins? What is it?

-u flag on the command line.

You may also need to tell your synthesiser.

Regards,
Allan.

 

[Bret Wade]

Kelvin wrote:

Hi, there:

I remembered there was a constraint that can prevent MAP from
removing floating input pins? What is it?

Thanks.
Kelvin

The net constraint "S" will block trimming on an undriven or unloaded
net. An example of UCF syntax is:

NET "net_name" S ;

When map is run with the "-u" switch, this constraint is automatically
applied throughout the design.

Bret