Urgent help needed - Stratix IV 2.5V LCMOS output termination

Question

Hi

We get the following:

Error (169006): I/O pin "..." specifies a Termination logic option setting of SERIES 50 OHMS WITH CALIBRATION, which is not supported by the device

When trying to set 50ohm series resistor on an output pin. The pin is regular LVCMOS 2.5V, default 12ma current. For instance location - PIN_AB39.

No other special assignments on this pin.

The assignment is done in TCL script as follows:

set_instance_assignment -name OUTPUT_TERMINATION "SERIES 50 OHMS WITH CALIBRATION" -to <pin name>

The device is Stratix IV 820, p/n EP4SE820F43C3

This should work according to the device documentation, please advise what's wrong here.

Thanks

Michael Vinokur

Broadcom corp.

altera_forum · Answer

Off the top of my head, you have to supply a 'reference' 50 Ohms at a dedicated input (for the bank) to allow calibration.

You mustn't have done this, or haven't told Quartus you have.

Possibly.

Try it without calibration?

Nial.

altera_forum · Answer

Hi  The idea was to use OCT without calibration, I got the same error. The above was one of many trials.   Thanks Michael

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