Depending on which simulator you use, you need different models. I use IS
from Mentor Graphics, so I need EBD files. We just requested EBD (with
IBIS) files from every memory vendor we could find. We got EBD files only
from NEC. They look pretty good so far. Most of the others gave me IBIS
files with R_pin, L_pin, and C_pin large enough to try to represent the DIMM
traces. Close, but no cookie! I haven't even tried to simulate with these.
A few vendors asked, "What is IBIS?" and gave us spice models of the buffer
on the memory chip. thanks. If you use XTK, you might be able to get a
TOPSPEC from IBM.
From: Kim Helliwell [mailto:firstname.lastname@example.org]
Sent: Wednesday, 04 August, 1999 4:32 PM
Subject: [SI-LIST] : Seeking SI models for memory
Anyone else doing PC motherboard design? How do you get or
fudge models for the memory modules on the board?
The obvious thing is to request the .brd file for the DIMM
from the manufacturer, but for some reason, they are
reluctant to part with this information. I can't imagine
why :-) Actually, I really can't; there can't be that much
proprietary content in such a small board, after all.
Neophyte that I am to the SI world, I'm blocked, but I just
bet there is some dodge around this problem that someone
else has come up with. If so, would you be willing to
Am I overlooking something obvious?
Senior CAE Engineer
Phone: 650 694 5030 FAX: 650 943 7260
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