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Sdram controller on the Altera Cyclone board?
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kingkang



Joined: 02 Jan 2004
Posts: 23
Post07 Apr 2005 9:36   

Sdram controller on the Altera Cyclone board?
Hi
I wrote a sdram controller which has pass the RTL simulation.
But when it come to the Altera cyclone board,the read/write data
were wrong.I have written sdram with some data,and then I read the
data from sdram.But found the data is not equal to what have been written into the sdram.One or Some bits have wrong.It is random bit error!
I don't know what's wrong.About the clock? or board delay? or else?
Please help me out!
Thanks and Regards!
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revolt



Joined: 03 Feb 2002
Posts: 121
Helped: 2
Post07 Apr 2005 18:26   

Sdram controller on the @ltera Cyclone board?
Did you simulate your controller with a simulation model of your SDRAM?
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kingkang



Joined: 02 Jan 2004
Posts: 23
Post10 Apr 2005 16:04   

Sdram controller on the @ltera Cyclone board?
Yes,I have simulated it corectly.
I think it might be the the PCB disturb between the wires!
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revolt



Joined: 03 Feb 2002
Posts: 121
Helped: 2
Post11 Apr 2005 15:19   

Sdram controller on the @ltera Cyclone board?
Did you also perform a P&R simulation?
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revolt



Joined: 03 Feb 2002
Posts: 121
Helped: 2
Post11 Apr 2005 21:58   

Sdram controller on the @ltera Cyclone board?
how have you connect the FPGA with your SDRAM?
Have you select the right driver standard?
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kingkang



Joined: 02 Jan 2004
Posts: 23
Post16 Apr 2005 6:14   

Sdram controller on the @ltera Cyclone board?
Oh,I increase the sdram refresh rate and it works!Sad
I connect FPGA general IO with SDRAM!
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