transition :
An xbit-to-xreal transition filter.

The transition primitive converts an xbit-typed, binary signal to an xreal-typed, analog signal, by assigning analog values to the 0- and 1-levels and optionally making the transition times finite. It can also model additional inertial delay.

The parameters value0 and value1 define the corresponding analog values to the input’s 0 and 1 values, respectively. The parameters rise_time and fall_time define the rise and fall times of the 0-to-1 and 1-to-0 transitions, respectively. The parameters rise_time and fall_time by default have values of 0.0, in which case, the corresponding transition will occur instantaneously. If the parameter rise_time or fall_time takes a positive value, the value must be greater than the unit simulation time step (i.e. time precision).

The parameter delay specifies the optional inertial delay of the primitive applied before the conversion. In other words, if the xbit-typed input in changes to a new value before the time equal to delay elapses since the previous input value change, the previous input change event will be overriden by the new input change event. When the parameter rise_time or fall_time has a value greater than 0.0, the parameter delay assumes the minimum value equal to the unit simulation timestep (i.e. time precision).

The parameters valueX and valueZ define the mapped values of logic X and logic Z, respectively. For example, if valueX is set to 0, all input values corresponding to logic X are treated as logic 0. Note that by default, the primitive ignores the logic X and logic Z values of the input and retains the last output value.

Input/Output Terminals

Name	I/O	Type	Description
out	output	xreal	analog output
in	input	xbit	digital input

Parameters

Name	Type	Default	Unit	Description
value0	real	0.0	None	value for logic 0
value1	real	1.0	None	value for logic 1
rise_time	real	0.0	seconds	rise transition time
fall_time	real	0.0	seconds	fall transition time
delay	real	0.0	seconds	propagation delay
valueX	logic	1’bx	None	mapped value of logic X
valueZ	logic	1’bz	None	mapped value of logic Z