In Cadnece verilog ams what is use of time_tol and expr_tol in ABOVE function?

[mansimane]

Hi,
In ncsim, there are connect_libs functions to convert electrical signals in spectre netlist to logical signals eg E2L. But what is significance of parameters like tr (rise time) in those functions?

Those functions use "above" function to convert spectre signal into digital...but how time_tol and expr_tol affects functionality of the above function?

Thanks

 

[simulbarua]

"above" is a function that monitors the threshold crossing. It will create an event when the argument crosses zero in the positive direction. if expr_tol is given for an 'above' function then the event will occur within expr_tol . If time_tol is specified then event will occur within time_tol seconds of zero crossing.