FreeLists / si-list / [SI-LIST] Re: METASTABILITY

["ariazi" <ariazi@xxxxxxxxxxxxxxx>]

>In many cases, metastability in flip-flops can be avoided by ensuring=20
>that the data and control inputs are held constant for specified=20
>periods before and after the clock pulse, called the setup time (tsu)=20
>and the hold time (th) respectively.  These times are specified in the=20
>data sheet for the device, and are typically between a few nanoseconds=20
>and a few hundred nanoseconds for modern devices.

It seems that the "nanoseconds" in above paragraphs should have been
"picoseconds".
As an example, for a DDR2 SDRAM device such as Micron MT47H64M8 the DQ =
input
setup time
tDS and input hold time tDH relative to DQS are 300ps and 175ps
respectively.

Regards,

Abe Riazi
ServerWorks




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