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Designer File Formats >
   Nexxim Netlist Format >
       Subcircuits >
           Boundary Nodes

Boundary Nodes

The nodes in the list of boundary_nodes on the subcircuit definition line represent points of connection to the external circuit. In subcircuit sub1 above, the nodes sub1in and sub1out are the boundary nodes.

Note

A subcircuit can be defined without any boundary nodes, in which case it can connect only to nodes defined as GLOBAL nodes. See Global Nodes in Subcircuits for details.

The boundary nodes can have any names except 0, GROUND, GND, and GND!, which stand for the global reference node. The boundary node names do not represent actual nodes in the circuit, they are just dummy names used within the subcircuit.

When a node name inside the subcircuit definition is in the list of boundary_nodes, the element node will be connected to the corresponding external circuit node when the subcircuit is instantiated.

In this subcircuit example, sub1, nodes sub1in and sub1out are the boundary nodes. Naming nodes sub1in in the R1 instance statement and sub1out in the L1 instance statement create connections to the external circuit nodes:

.SUBCKT sub1 sub1in sub1out

R1 sub1in sub1local ser_res

L1 sub1local sub1out ser_ind

.ENDS

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