problem with RS485 or RS232

[Davide Canina]

Dear all, <BR>
I would like to know if it's possible to create an interface from Virtex II-FPGA's to serial RS485 or RS232,please ? <BR>
Do you have some application notes or technical issues for this problem,please? <BR>
Thank you very much for your help. <BR>
Best regards, <BR>
Davide Canina

 

[MARTIN jm]

Look at: www.fpga4fun.com

=&gt; serial interface.

Good luck

 

[valentin tihomirov]

As rs232 requires +/-15v, rs422 should be simpler cos Virtex should support
differential signaling.

 

[Mario Trams]

Davide Canina wrote:

Dear all, &lt;BR
I would like to know if it's possible to create an interface from Virtex
II-FPGA's to serial RS485 or RS232,please ? <BR> Do you have some
application notes or technical issues for this problem,please? <BR> Thank
you very much for your help. <BR> Best regards, &lt;BR

If you want to attach RS485 or RS232 lines directly to the FPGA I would
not do this. And, as Valentin said, you get some voltage level problems.
Normally, one uses special RS232 or RS485 transceivers that are driven
by standard levels.

As for the logical part, you need to implement some standard UART
functionality in your FPGA. If you don't know how to do that, have a
look at the link Martin gave you, or check out www.opencores.org.

Regards,
Mario