Description
Due to a problem in the Quartus® II software versions 10.1 SP1 and earlier, you may be unable to change D3 delay chain values in Stratix® IV devices using the Resource Property Editor to make an Engineering Change Order (ECO) .
To work around this problem, set D3 delay chain values using the Assignment Editor and recompile the design.
This problem is fixed beginning with the Quartus II software version 11.0.