07-09-2009 02:43 AM
I would like to use the DCI feature in Virtex 5 for a few signals.
I have configured those pins to be LVDCI_33 in the ucf file and I have the reference resistors on VRP and VRN.
However, the DCI does not seem to be working.
Is there any implementation steps or code that need to be added into the design ?
07-09-2009 03:51 AM
I make some changes to the value of the resistors on VRN and VRP, but did not observe any difference in the output (it is used as a clock output pin).
That is why I suspect the DCI is not functioning (or activated).
As this is the first time I am using the DCI feature and I could not find any detailed implementation info, I could only trial and error.
Hence, I really hope that someone with experience on this could advise on the steps needed to ensure the DCI is activated.
07-09-2009 05:29 AM
07-09-2009 08:33 AM
Yes, the pad report does show that the pin is LVDCI_33.
I noted that there is a column "DCI Value". It is blank. Is this correct ?
07-09-2009 10:58 AM
Questions on items I have found so far.
Is there a need to instantiate/use the "DCI Reset" block (the one with a "LOCKED" output) ?
Also, I noted some possible configurations for DCI, e.g. continuous matching mode, etc. Is there a need to select any of such configurations ?
Really appreciate your above replies.