[SI-LIST] Re: DDR2 inteface consultant needed

The Samsung DDR II SRAMs that we used specified HSTL I/O.  You might 
consider trying HSTL differential outputs.  As long as you run them at 
the 1.8V VCCO they should be voltage level compatible with SSTL. 

Perhaps others could comment on the difference between HSTL and SSTL 
drivers.

Chris

Robert Szumowicz wrote:
> Yes, I meant whatever termination with Thevenin equivalent circuit, can 
> be composed out of one or two resistors. May is soon so I am looking 
> forward for your results.
>
> You say that you use HSTL drivers not SSTL drives on a Virtex 4 device. 
> May I ask you what is a reason? The problem with Spartan 3 is that it 
> does not support differential SSTL18 IO standard but it does support 
> differential HSTL. The clock output which is a differential output is 
> configured as two separate single ended outputs with 180 degree phase 
> shift between them.
>
> Robert
>   
>
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