Keywords: constraint, iobdelay, MCH, OPD, DDR
The TestApp_Memory test used to work in 9.1i, but after installing EDK Service Pack 2, it now fails. The MCH OPB DDR and the OPB DDR controllers do not seem to work any more. What is the problem?
An update to a core now omits certain constraints.
To get the memory test to pass, add the following constraints:
NET "*/DDR_DQ_I*" IOBDELAY=NONE;
NET "*/DDR_DQS_I*" IOBDELAY=NONE;
NET "*/DDR_DQS_T*" IOBDELAY=NONE;