read_saif -scale problem

[SS]

Hi,

I have a timescale of 1ns/10ps set for my verilog simulation and 1ns is
the timeunit of my gate library. When I back annotate the saif file
onto the synthesis tool using read_saif, I had to put a "-scale 10"
value, to match input activity statistics, though my timeunits are the
same.

Does anyone know why I had to add "-scale 10" to read_saif even though
the timeunits are the same?

Please help.

Thanks in advance
SS