"Tim" wrote in message
...

What has be scratching my head is that it must be "seeing" the last 16
bits
and control word or it wouldn't come alive. Has anyone any input on what
may
be missing, similar problems? I clock out 32 bit freq control, then 8 bit
control word then a 10us wide F_update pulse. Again, stable, working but
ignoring last 16 bits.

Sorry to bother the group, a typo in the source code was the problem.
The DDS VFO is now smooth as silk... See you on 40m CW

Tim