I've got a DCM as part of a 4 byte Aurora implementation on a VII Pro. Sometimes after JTAG configuration the DCM just won't lock (hence the ChannelUp never happens either). Once it's decided not to work, doing the reconfiguration again or resetting has no effect. If I then configure with an old version of code (also with a power cycle) it works OK with old and new code. Are there any tricks I should know about here either in the VHDL or settings in the tools that anyone can tell me about please as I really need to get around this problem?
TIA,
Rog.