[SI-LIST] DDR2 SODIMM AT SPEEDS ABOVE 533Mbps
- From: "J.Jebakumar Samuel" <j.jebakumarsamuel@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 27 Jul 2007 18:50:25 +0530
I am using a Virtex-4 FPGA in a new design. I have provided two sodimm
connectors. I am using 2T (common address and command bus)topology. I tried
simulating it with 2GB SODIMM modules from micron. The address and command
signals are not even passing the sstl valid levels when the speed is beyond
200MHz. But below 200MHz it is operating fine. I am planning to operate the
SODIMM's at 666Mbps. In simulation we used, SSTL18_IO, SSTL18_I_DCI_O,
SSTL18_II_DCI_O buffers but the results are the same. The routed trace length
is just less than 5inches.
Thanks
Samuel
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