xbit_to_real_var :
An xbit-to-real connector with variable logic-1 and logic-0 levels.

The xbit_to_real_var primitive converts an xbit-type signal to a real-type signal with variable logic-1 and logic-0 levels. The digital level of the input signal is converted to an analog level, defined by the two external real-type inputs: level0 and level1. The output signal makes instantaneous transitions with zero rise/fall times.

The parameter delay specifies the inertial delay of the primitive. In other words, if a new input event arrives before the previous event propagates to the output, the previous event will be cancelled.

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	real	real-type output
in	input	xbit	xbit-type input
level0	input	real	conversion level for logic 0
level1	input	real	conversion level for logic 1

Parameters

Name	Type	Default	Unit	Description
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