quartus 12.1 compilation too long using altiobuf in CycloneV

hi, Rysc, I have previously looked at the examples, the document 'Design Manual_Dynamic Delay Chain (Stratix V)‘ indeed help me a lot.

However, these examples use StratixIV and V to show the usage of altiobuf with programmable output delay.

my device is CycloneV, and i use altiobuf with programmable input delay, i dont know if these make differences(especially with a different device).

And i try to just use the IOBUFS to make a test design as you said, unfortunately, Quartus 12.1 gives a internal error during systhesis process, please see the attached message.

Regards,

ingdxdy