[partial-reconfig] DCM STATUS signal problem

[mlee@xxxxxxxxxxxxx]

Hi All,

Sorry to bother you. I have no choice but to seek for your help on this.

I have a Virtex-II Partial Reconfiguration design, which contains 3
modules (1 reconfig, 2 fixed). One of the fixed module is a Microblaze
(MB) system which uses DDR memory on my Memec MB2V1000 board. EDK tool
automatically generates 3 DCM modules to work with DDR memory when I set
the processor clock and DDR clock to 66.67MHz (the lowest speed DDR can
work at).

During the Active Implementation phase, when tring to MAP this MB module,
it gave me this error which I have no idea what it means. One thing to
note is that I used the "-u" switch, which does not remove logic. If I
don't set "-u", many errors will come up telling me it cannot combine
certain slices together, etc..

Anyways, for some reason, the mapper returns the following error message
regarding that the other bits of the STATUS signal are used:

ERROR:LIT:144 - Only STATUS0, STATUS1 and STATUS2 can be used in DCM symbol
   "sys/dcm_2/dcm_2/DCM_INST" (output signal=sys/dcm_2/dcm_2/CLK0_BUF).

And for Partial Reconfiguration, do I have to LOC the DCM modules? Since
DCMs are parts of the MB system, I assume they will be within the MB
module's boundary, so I won't have to specifically LOC the DCMs? Or I am
wrong~~ (very possible)

Does anyone have similar problem when working with DDR & DCM?

Thank you so very very much for your time and help!


Peter Lee

--------------------------------------
OPRAL Research Lab, Ryerson University

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