DATA0 pin in Cyclone III device

Hi all,

From the datasheet of 3c120 (cyclone III), the data[0] is a pin used
in configuration, and in user mode it can be used as a dedicated input
pin with "optional user control". But when I use it as an input pin in
my design, the fitter reports an error saying this pin has been used.
Is there any settings I should set before I can use this pin in user
mode?

Thanks,
Hua

On May 30, 10:06 am, Hua <Tommy...@gmail.com> wrote:
> Hi all,
>
> From the datasheet of 3c120 (cyclone III), the data[0] is a pin used
> in configuration, and in user mode it can be used as a dedicated input
> pin with "optional user control". But when I use it as an input pin in
> my design, the fitter reports an error saying this pin has been used.
> Is there any settings I should set before I can use this pin in user
> mode?
>
> Thanks,
> Hua

In the Device and Pins menu, Dual-Purpose Pins tab (Setting->Device-
>Device and Pins Options->Dual-Purpose pins.) there's an option for
what this pin should be after configuration.

My guess is that you need to set this.

G.