[SI-LIST] Re: SDRAM problem
- From: steve weir <weirsp@xxxxxxxxxx>
- To: peter.zhu@xxxxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 15 Sep 2004 03:27:41 -0700
Peter, unfortunately different RAMs have different driver
characteristics. 10 ohms is a bit light for SDR / DDR. Your problem
sounds like ringing and/or crosstalk. You should resimulate your models to
determine why you have 10 ohm resistors instead of 24 - 33 ohms.
Steve.
At 05:12 PM 9/15/2004 +0800, peter zhu wrote:
>All:
>Deos any encounter SDRAM data bus SI problem without series resistor(10 ohm)
>on data bus?
>
>I meet such problem in Miron 512Mb SDRAM chip working with Marvell 64260
>bridge. This problem result in CPU unstability. When I change to Samesung
>512MB SDRAM chip. the problem disappear.
>
>Peter
>
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