[SI-LIST] Adding uncertainty to signal sources

Hi all - I'm  a new member of SI mailing list and would like to pose a 
question. I'm wondering if there is a way to add jitter or a variable amount of 
uncertainty to the rising/falling edges of a signal source such as 'pulse' or 
in my case the built-in PBRS function (lfsr). I'm attempting to characterize a 
valid data window for a DDR2 memory interface, and would like to introduce more 
uncertainty into my source than is currently being generated by the output 
buffer of my SDRAM model.
Regards,
Tom R Strout
Staff Hardware Engineer
Hifn Inc.
111 Speen St., Suite 210
Framingham, Ma. 01701
508-620-1158 x119

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