Forum Discussion

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

warning on ALT_ASMI_Parallel_Interface

I have a Cyclone III EP3C5 design that uses an EPCS4 device in AS mode for remote system update.

I add the ALT_ASMI_Parallel_Interface for writing and reading EPCS4,but quartus gives Warning: Following 1 pins must use external clamping diodes. I found this pin: cycloneii_asmiblock3~ALTERA_DATA0. it's not in my port list, i guess it is automatic assigned by quartus when using ALT_ASMI_Parallel_Interface.

does anyone know how to deal with this?

Thanks a lot in advance

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    The warning is about configuration pin DAT0. I would however primarly follow the device manual suggestions that recommend a series termination at the EPCS device but no clamping diode.