Thanks for the response -- very useful and I got a good chuckle to boot! BTW, can you tell me (without having to kill me) when all of this DDR-II info is supposed to become public? I heard Sept -- I'm hoping it's Sept 1. Thanks, -Bret Quoting "D. C. Sessions" <dcs@xxxxxxxxxxxxxxxx>: > > On Mon, 2002-08-12 at 11:35, Bret Stott wrote: > > > I am a new member of this list and I have a few questions about DDR-II that > I > > was hoping someone could help me out with. Currently, I don't have access > to > > JEDEC so most of my information is from alternate sources such as the > Samsung > > DDR-II spec. > > > > o Can anyone point me at a SSTL_18 specification? > > Yes, but then I'd have to kill you. > > Seriously, this should be hitting publication Very Soon Now. > We just recently gave the JEDEC office the go-ahead. Look > for JESD8-15. > > > o Can someone help me understand the on-die-termination strategy for > DDR-II? > > Why are the values 75 & 150 Ohms? What electrical topology is being > assumed? > > Your basic DDR DRAM topology, w/o the motherboard shunt resistors. > ODT is still somewhat controversial, which is why there are > provisions to disable it altogether. > > > o My initial analysis suggests that it is possible to use class I drivers > for > > the address bus (5 load) and also for a point-to-point data bus. The data > bus > > may require some non-standard termination values though. Does anyone have > any > > information that supports of refutes this? > > There Is No Class One. SSTL-18 ditches the "Class I" driver > spec since the SSTL-2 class I spec has caused a lot of > confusion and we couldn't find any valid uses for it. > > (Yeah, I know that that last if flame bait. If you don't like > the JC-16 tendency to concentrate on DRAM to the exclusion of > other applications, JOIN THE FREAKING COMMITTEE!) > > -- > | May I have the serenity to accept the things I cannot change, | > | the strength to change the things I cannot accept, and the | > | cunning to hide the bodies of those who got in my way. | > +------------- D. C. Sessions <dcs@xxxxxxxxxxxxxxxx> -----------+ > > > ------------------------------------------------------------------ > 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 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 > > ---------------------------------------------------------------- Bret Stott phone: (408) 772-5028 Syano Designs fax: (408) 243-1850 771 Hilmar Street email: bstott@xxxxxxxxxxxxxxxx Santa Clara, CA 95050 http://www.syanodesigns.com ---------------------------------------------------------------- ------------------------------------------------------------------ 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 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