Forum Discussion

Robert_H_Intel's avatar
Robert_H_Intel
Icon for New Contributor rankNew Contributor
4 years ago

IO_OBUF polarity not matching RTL

I am working on a design using an Agilex F-series part (AGFB014R24B2E3V) and am having issues with tri-stated outputs. The RTL in question is: assign TRIG[0] = (lb_enable_dd) ? clk_fast : 1'bz; ...
ShengN_altera's avatar
ShengN_altera
Icon for Super Contributor rankSuper Contributor
4 years ago

Hi,

Tri-state buffer can be either active high or active low. There are many types of it you can refer here. What I can guess is that IO_OBUF is most likely an active low tri-state buffer.

Moreover, --OE is active high-- you highlighted in manual don't very related to IO_OBUF mentioned above. That is for Data Interface Signals of gpio ip.

Best regards,
Sheng

p/s: If any answer from the community or Intel support are helpful, please feel free to give Kudos.