[SI-LIST] SSO SSTL Vs LVTTL

Hi,
I did quite node simulations in LVTTL and SSTL class I and II pads. I used 
transmission line models for all the 
simulations with noise measured at the Far End.
I tried to operate the LVTTL pads at 3.3V with 12mA drive strength. I could see
the noise is more than with SSTL2-I/II interface. 
Since there were no terminations for LVTTL, I suspect it can give more noise 
compared to 
SSTL. Comments are appreciated.

Even between SSTL2-I and II the power:signal is nearly same (the quite node 
noise is similar), 
with class-II is slightly more than class-I and in lower power:signal ratios, 
the noise is less in 
class-II compared to class-I. 
I feel SSTL2-class-II have two terminations, which makes the interface less 
noisier compared
to SSTL2-Class-I. Comments are appreciated.

Regards
Canes




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