cyclone II differential IO error

Question

Hi,

I have an LVDS transmitter and LVDS receiver in my design and i am getting below error when i do systhesis.

"Input port DIFFERENTIALIN can only connect to output port DIFFERENTIALOUT of another IO atom"

I have also attached the file in which it is giving this error.

Thanks,

altera_forum · Answer

--- Quote Start ---

Hi,

I have an LVDS transmitter and LVDS receiver in my design and i am getting below error when i do systhesis.

"Input port DIFFERENTIALIN can only connect to output port DIFFERENTIALOUT of another IO atom"

I have also attached the file in which it is giving this error.

Thanks,

--- Quote End ---

Goto Assigment -> Pin planner. Select that you signal is LVDS. Connect positive and negative signals to pins.

altera_forum · Answer

The solution you suggested does not work, still i am getting sythesis error.

altera_forum · Answer

ARTEM,

one more thing when i chane the device to cyclone III and do sythesis then it does not give any error even if i do not assign pin for LVDS signals.

Is it some issue with ALTLVDS of cyclone ii?

regards,

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