[SI-LIST] The necessity of Pull-up resistors in DDR2
- From: Hirshtal Itzhak <ihirshtal@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 31 Jan 2010 14:42:44 +0200
Hello SI Experts
I've conducted some pre-layout simulations on a DDR2 bus connected to
on-board DDR2 devices.
I found out that I get proper waveforms even if I don't use pull-up
resistors on the Address & Control lines.
I wonder if this is an acceptable result! I've always been using those
pull-up resistors in previous designs.
Is it a mandatory requirement to have a pull-up resistor to VTT on these
lines?
If I don't use them, how is the dynamic current supposed to be supplied
to the lines?
What could go wrong (if at all) if I don't include them in the design?
Thanks
Itzhak hirshtal
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