title: About timing precision of sdf file when simulation in ncsim
body: <p>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:</p>
  
  <pre><code>(CELL
    (CELLTYPE "BUFCLKHD30X")
    (INSTANCE U10)
    (DELAY
      (ABSOLUTE
      (IOPATH A Z (0.263:0.266:0.266) (0.257:0.259:0.259))
      )
    )
  )
  </code></pre>
  
  <p>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.</p>
  
  <p>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).</p>
  
  <p>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.</p>
  
  <p>Many thanks.</p>