The DDR will never be a "slow drive". However, the x32 GDDR parts do allow more control over drive strength. As long as you keep the lines short, you should have no problems with a simple series resistor in each line. This is a very common termination scheme for point-to-point DDR designs. If it were not for the 300mV overshoot specs. on most DDR memory controllers, you wouldn't even need the series resistors. David -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Anders Frederiksen Sent: Thursday, February 03, 2005 5:00 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] DDR-1 termination (short point-to-point) I'm connecting a lot of DDR1 ram to a FPGA (Virtex2pro). Common schemes recommended is "embedding a DIMM design" (which would be plain stupid imho) and doing a full parallel termination in both ends (typically in 0402). The latter is naturally sensible - but it occurs to be kind of a overkill for ponit-to-point lines of "only" 5cm (~2") or less. Has anyone experience with simpler termination schemes? I mean for standard busses one would rely on slow drivers only... Cheers, Anders ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu