[SI-LIST] Re: Multiple Vref inputs for QDR SRAMs

Aaron,

Usually, the Vref network is not terminated and does not have lossy
elements. Any noise that couples into the network will not be dissipated
quickly. To reduce the amount of noise coupling into the network, it is
better to have several small independent Vref networks instead of connecting
them all together and supplying them from a single source.

Thanks,
Vinu


Aaron Frank wrote:

> Can anybody enlighten me on why one would design multiple Vref inputs for
> QDR (HSTL) SRAMs?
> My assumption is that all Vref inputs are fed by a common Vdd/2 source.
>
> Most SRAMs have two Vref inputs, and some QDR controllers have up to 8
> inputs.
>
> thnx
> AAron
>
> *************************************
> Aaron Frank, P.Eng.
> Technical Lead, Systems Engineering
> SiberCore Technologies
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