Re: [Discuss-gnuradio] Default FPGA I/O standard

[Matt Ettus]

Nirali Patel wrote:
> Hi Matt,
>
> I modified the usrp_std.v file to make connections to the debug IO pins and
> then on my PC tried to compile the project using Quartus II software. The
> compile went successfully, but later when I opened the Pin-Out file under
> Compilation Report all the signals showed at 3.3V-LVTTL. I had only clicked
> on the play button after opening the .qpf project. 
> I would like to know if the default settings are still all 3.3V LVCMOS and I
> inadvertently changed something. If not, I would like to set the 16-bit
> debug pins to LVCMOS since I am trying to attach a CMOS cable to the pins on
> basic RX. Could you recommend a way to do this? Do I have to look at IO
> banking rules etc.? I have some FPGA background but not a whole lot.
>   

I think 3.3V LVTTL and LVCMOS are really the same.

Matt