Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Tri-State BiDirectional Pin MAX10

All, Since I am trying to port some older schematic files to the MAX10. I have found out it isn't just a recompile (it doesn't like Alt_IOBUFs or ALT_OUTBUF_TRIs). It was suggested to me from thi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Yes, the purple port outputs the actual level of the bidirectional pin, which can be either '1' or '0' when read as a digital signal, bot not 'Z'. The primary purpose is to read the level driven by an external device, but if the pin is temporary floating, you still read '1' or '0', may be arbitrarily changing, or in case of CMOS logic more likely holding the previously driven level for at least several µs.