[SI-LIST] Re: Displaying eye pattern in an oscilloscope?
- From: Ihsan Erdin <erdinih@xxxxxxxxx>
- To: Chris.Cheng@xxxxxxxxxxxx
- Date: Sat, 22 Oct 2005 23:14:36 -0400
I'm not sure if it's possible at all. To capture a read or write cycle,
you'll need a logic triggering setup for data and control signals (/WE, /CS)
as Chris describes. For an eye diagram pattern, on the other hand, you'll
need an edge trigger setup either at the clock or the data itself with a
delay (one or two periods) A logic triggering with an infinite persistence
display setting will not result an eye diagram.
Ihsan Erdin
On 10/22/05, Chris Cheng <Chris.Cheng@xxxxxxxxxxxx> wrote:
>
> Not that simple.
> You will most like need some advanced triggering to trigger on CAS, WE so
> that you can tell if it is a read or write. Then you probably need some
> software to limit the hit to certain address to be sure you get the right
> DIMM. Good luck if you need to see the effect of interleave vs.
> non-interleave.
> ________________________________
>
> From: si-list-bounce@xxxxxxxxxxxxx on behalf of steve weir
> Sent: Fri 10/21/2005 10:59 PM
> To: rrepollo@xxxxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Displaying eye pattern in an oscilloscope?
>
>
>
> Don't you have access to both clock and data?
>
>
> Steve
> At 09:17 AM 10/22/2005 +0800, Rep wrote:
> >Good day!
> >
> >I simulated a data signal from SH4 processor to SDRAM, displaying it in
> an
> >eye pattern.
> >I need to verify the signal by actual board evaluation.
> >Could please someone tell me how I could measure the
> >signal in eye pattern through the use of an oscilloscope (TEK)?
> >
> >I would really appreciated any help I could get.
> >
> >Thank you.
> >
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