[SI-LIST] Re: SDRAM data bus SI problem
- From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 28 Oct 2004 10:28:25 -0400
If you are seeing the ringing (glitch) at the package pin, check what it
looks like at the die pad, if it's accessible in your simulation.
Also take a look at the package model for the SDRAM controller (the load
device). If it has a lot of inductance, you may get a glitch in the
waveform at the IC pin, which is difficult to eliminate. But the waveform
at the IC die pad may be clean.
A small bit of capacitance at the load pin *might* reduce/eliminate the
ringing, but might have undesirable results.
Regards,
Andy
> I encountered SDR SDRAM data bus SI problem. From the simulation, I see a
> serious ring during rising edge when source is SDRAM and the destination
> is
> SDRAM controller(point to point). The ring cause the data error in memroy
> R/W operation.
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