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Contributor
Contributor
6,630 Views
Registered: ‎06-12-2009

EDK 11.1 with SDR SDRAM

In EDK 10.1 using Base System Builder, new design for custom board, there was an option to select SDR SDRAM.  Now with EDK 11.1 I do not see that option.... only DDR and DDR2.  Is Xilinx trying to tell me not to use SDR SDRAM in a new design, or am I expected to select DDR then change the mpmc core later to SDR ?

Thanks, 

 

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Explorer
Explorer
6,611 Views
Registered: ‎08-16-2008

Re: EDK 11.1 with SDR SDRAM

Hi jimbrady. I have changed mpmc to sdram and encounter with another problem: i can't set mpmc clock to 80Mhz, XPS don't allow me to do it. This this the clock of my sdram.
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Anonymous
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Re: EDK 11.1 with SDR SDRAM

Yes, I encountered the same problem and the same feeling.
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Contributor
Contributor
6,402 Views
Registered: ‎06-12-2009

Re: EDK 11.1 with SDR SDRAM

km_zzy :

 

The Xilinx mpmc document says that SDR SDRAM is supported and explains how to use it (see link below) , so am proceeding with a design that uses it.  In a few weeks I will be able to say for sure if it works !  One thing to note is that there is some complication with needing an extra clock and a DCM to generate it, and playing with the DCM phase shift to optimize timing.  But I gather that if the SDRAM clock speed is low enough you can just go with a fixed phase extra clock.  Even so I think it is still simpler than using a DDR SDRAM part.  Plus it allows me to do everything with 3.3V.

 

For XPS, what helped was to create a custom board definition file "xbd file" for my proto board and specify SDR SDRAM in that.  Then when I use Base System Builder I select my custom xbd file and XPS happily comes up with a SDRAM core, and generates a design using the pinout specified in my xbd file.  There are some example xbd files around on the web.  The xbd file made it easier to create a design with SDR SDRAM.

 

http://www.xilinx.com/support/documentation/ip_documentation/mpmc.pdf

 

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Visitor
Visitor
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Registered: ‎01-06-2009

Re: EDK 11.1 with SDR SDRAM

Did you ever get your SDRAM to work?

 

 We're in exactly the same situation now.

 

 

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