Dear Aalelai, The cross() function in the Calculator may be used with a waveform to determine the time at which the waveform crosses a specific voltage threshold. One of its options allows you to select the slope of the waveform at which it crosses and a second option allows you to select which edge number of the waveform to use to determine the crossing time. Its options from the ocean reference manual follow. You may also use the cross function in combination with the clip() function to window the output of your delay cell to only consider the time after the input edge to the delay cell is applied to guarantee your propagation delay time is positive. I hope this helps. Shawn cross cross( o_waveform n_crossVal x_n s_crossType [ g_multiple [ s_Xname ] ] ) => o_waveform / g_value / nil Description Computes the X-axis value at which a particular crossing of the specified edge type of the threshold value occurs. Gets the time value (X axis) corresponding to specified voltage "/net9"=2.5V (Y axis) for the second rising edge. ------------------------- Arguments Value Returned Example cross( v( "/net9" ) 2.5 2 ’rising ) o_waveform Waveform object representing simulation results that can be displayed as a series of points on a grid. (A waveform object identifier looks like this: srrWave:XXXXX .) n_crossVal Y-axis value at which the corresponding values of X are calculated. x_n Number that specifies which X value to return. If x_n equals 1 , the first X value with a crossing is returned. If x_n equals 2 , the second X value with a crossing is returned, and so on. If you specify a negative integer for x_n , the X values with crossings are counted from right to left (from maximum to minimum). If you specify x_n equals to 0, it returns all occurrences of the crossing events. s_crossType Type of the crossing. Valid values: ’rising , ’falling , ’either . g_multiple An optional boolean argument that takes the value nil by default. If set to t , the value specified for the x_n argument is ignored and the function returns all occurrences of the crossing event. s_xName An optional argument that is used only when g_multiple is set to t . It takes the value time by default. It controls the contents of the x vector of the waveform object returned by the function. Valid values: ’time , ’cycle o_waveform Returns a waveform if the input argument is a family of waveforms. g_value Returns the X-axis value of the crossing point if the input argument is a single waveform. nil Returns nil and an error message otherwise. ---------- Example cross( v( "/net9" ) 2.5 2 ’rising ) Gets the time value (X axis) corresponding to specified voltage "/net9"=2.5V (Y axis) for the second rising edge. cross( v( "/net9" ) 1.2 1 ’either ) Gets the time value (X axis) corresponding to specified voltage "/net9"=1.2V (Y axis) for the first edge, which can be a rising or falling edge. cross(VT("/out") 2.5 0 0 t "time") (s) Returns multiple occurrences of crossing events specified against time-points at which each crossing event occurs. cross(VT("/out") 2.5 0 0 t "cycle") (s) Returns multiple occurrences of crossing events specified against cycle numbers, where a cycle number refers to the n’th occurrence of the crossing event in the input waveform.
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