Yes, this is true. The Virtex-6 MGT power does not need the LC filters recommended by previous families. However, in addition to the recommended capacitors, be sure to follow the recommendations of creating "power islands" for MGTAVCC and MGTAVTT preferably sandwiched between two ground planes and isolated from other signals and signal vias. These can be created using a split plane to create islands only in the area on the MGTs. In the V6, this is delineated by a row of ground pins that stretch across the part. Also, care must be taken to follow recommendations for the choice of power supply and its noise characteristics. Xilinx however now even has qualified some Linear Technology low-noise switching supply modules for this as well as giving recommendations on choosing a linear supply.
My company has recently completed our V6 board layout and are using this power island approach without LC filters.
p.s: A late change in our design called for a change in package from the 1759 pin package to the 1156 pin package. This left us with one unused early access XC6VLX240T-1ff1759CES engineering sample silicon part that we will not be using. Anyone interested in purchasing it can find in for sale this week on ebay.com.
