RE: [oc] bidirection pin on acex 1k30 from Altera

[Richard Herveille <richard@asics.ws>]

Anyway, how about this:

gpio_port <= current_output when (output_sel = '1') else (others => 'Z'); 
-- capital Z
current_input <= gpio_port;

This is a concurrent statement (don't use a process for it).

Richard

>yes, sorry about this, I send this email and then a have seen his email
>sorry about this. I will put this work as an opencore (if anyone is 
>interested).
>
>Dani
>
>
>Am Don, 26 Jul 2001 schrieben Sie:
> > Dani,
> >
> > I am a newcomer to the opencores arena.  I hope I'm not out of line here,
> > but..
> >
> > It appears the work being done here has great potential, and is being 
> worked
> > on my some very great minds.
> >
> > I'd like to repeat the response give recently by Andy.
> >
> > "I think we should stick to the goals of this mailing-list,
> > whatever that means.
> >
> > So, I believe that this sort of questions should be addressed
> > to comp.lang.vhdl, comp.lang.verilog or another similar
> > usenet group. Let us focus on the running projects or in finding
> > new projects."
> >
> > Let's not clutter up the boards with topics that should be addressed
> > elsewhere.
> >
> > -----Original Message-----
> > From: Daniel Haensse [mailto:daniel.haensse@alumni.ethz.ch]
> > Sent: Wednesday, July 25, 2001 9:40 AM
> > To: cores@opencores.org
> > Cc: cores@opencores.org
> > Subject: [oc] bidirection pin on acex 1k30 from Altera
> >
> >
> > Hi folks,
> >
> > how can I implement a bidirectional port in vhdl. I try a inout declaration
> > of
> > the ioports. When the ports should be used as an input I use
> > gpioport <= 'z';
> >
> > using a ACEX 1k30 altera device I get an error that the compiler can't put
> > the
> > pin into tristate.
> > Do I have to declare the same pin as input as well as output, just using
> > names
> > like
> > in a process:
> > ...
> > iif gpiodirection='1' then
> >       gpioport_out <= 'z';
> > else
> >       gpioport_out<=currentoutput;
> > end if;
> > currentinput <=gpioport_in;
> > ...
> >
> > Does anybody has a simple example
> >
> > thank you
> >
> > Dani
> > --
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