switch :
A switch circuit element.

The switch primitive represents a two-terminal switch with on/off resistances. The parameters R0 and R1 define the resistance values when the input ctrl is 0 and 1, respectively.

The parameter ic defines the initial state of the switch, i.e., the assumed value of ctrl before it is initialized. In other words, at time=0, the switch will have the resistance assuming the input ctrl has the value of ic.

By default, when the input ctrl has a logic X or logic Z value, the switch enters an open state with infinite resistance. One can change this behavior by defining the mapped values for logic X and logic Z using the parameters valueX and valueZ, respectively. For example, if valueX is set to 0, the switch will have the resistance of R0 when its input ctrl has a logic X value.

Note that this primitive is a pseudo-module to describe a structural netlist of electrical circuits and not a behavioral model by itself. The XMODEL simulator extracts an event-driven behavioral model at run-time based on the circuit network described by these circuit-level pseudo-modules.

Input/Output Terminals

Name	I/O	Type	Description
pos	input	xreal	positive terminal
neg	input	xreal	negative terminal
ctrl	input	xbit	control signal

Parameters

Name	Type	Default	Unit	Description
R0	real	`INFINITY	ohms	resistance when ctrl=0
R1	real	0.01	ohms	resistance when ctrl=1
ic	logic	1’bx	None	initial switch state
valueX	logic	1’bx	None	mapped value of logic X
valueZ	logic	1’bz	None	mapped value of logic Z
Cpos	real	0.0	farads	pos-to-gnd capacitance
Cneg	real	0.0	farads	neg-to-gnd capacitance
m	real	1.0	None	multiplicity factor