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4,571 Views 2 Replies Last post: Jul 16, 2010 12:09 AM by toberrau RSS
toberrau Lurker 3 posts since
Jul 9, 2010
Currently Being Moderated

Jul 9, 2010 5:47 AM

HyperLynx DDRx Batch Simulation

Hello,
I have a problem with my DDRx Batch simulation.

My board has an PPC405 as DDR2 Controler and 2 Micron 1Gbit DDR2 400 Memories. I have also an 3. DDR2 for ECC on the ECC Port of the PPC405.


The simulation works fine, but in the results DDR_report_data_allcases_Typ.xls is in every write cycle in the comment:

 

"Multi-threshold for the strobe net is found!!! Calculation of setup/hold time is cancelled for this net!"

 

But the DDR_audit{Design1}.xls i get a pass in every signal.

 

Have someone an idea?

 

Nice weekend,

Thomas

 

(on the attached file, the red one is the signal on the DDR2 Memory. The yellow one on the PPC405)

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Steve_McKinney Aficionado 151 posts since
Jul 10, 2008
Currently Being Moderated
Jul 15, 2010 2:18 PM in response to: toberrau
Re: HyperLynx DDRx Batch Simulation

Hi Thomas,

 

I could be wrong, but it looks like the image that you posted is for a Data signal, not for the Strobe signal.  The warning message states that it's a multicrossing on the strobe.  Have you looked at your strobe waveform to see what's going on with that?

 

-Steve

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