About timing precision of sdf file when simulation in ncsim

iamyuchenjie

I find my  ncsim can only simualte the sdf file in precision of 10ps （round to 10ps）For exampe，This is a simple BUF sdf information:

1. (CELL
   
2.   (CELLTYPE "BUFCLKHD30X")
   
3.   (INSTANCE U10)
   
4.   (DELAY
   
5.     (ABSOLUTE
   
6.     (IOPATH A Z (0.263:0.266:0.266) (0.257:0.259:0.259))
   
7.     )
   
8.   )
   
9. )
   

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When I observe the timing sequence in simvision window, I found the simulator will round it to 270p when Z transfering from 0 to 1 because of the changing of A.
In my sdf file the Timescale (unit) is 1 ns. And in my testbench is 1ns/1ps. And according the tools documentation from cadence, the default timing precision of sdf elaberating/compiling is 1fs. I think that means we do not need to set any precision relating compiler option (like sdf_precision 1ps) in ma case. (BTW, I have tried such complier option, but help nothing).
How can I watch/oberseve a delay of 266ps or say precision in 1ps from my simulation window？ Mnay thanks.!My ncsim version is IES 2012, I thnik it was "latest" enough.
Many thanks.

amarnath1683

what is timing precesion

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