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Altera_Forum's avatar
Altera_Forum
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17 years ago

LVDS is input only in CycIII? no way!

I just received the following error message from QuartusII using a CycIII for LVDS outputs. The errored pins are in bank 4. "Error: I/O standard LVDS on output or bidirectional pin DAC_data1p ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

In general, LVDS is allowed for both inputs and outputs. Maybe there is a Cyclone III restriction for the particular side of the device you are using. (In some device families, pins on the top/bottom sides have LVDS support different from that on the left/right sides.)

Right-click the error message and go to its Help page to see if you get any clues there.

Later update: The Help page doesn't add much information for this error. You would have to use the device handbook to find out that the reason for the error is what FvM said in his post below about my suggestion that the restriction is related to the side of the device.