Wiring

Wiring

Wiring instructions occur inside module definitions. Wires connect pins of the module and pins of the containing instances.

wire <instname>['s] <instpin> [to] <instname>['s] <instpin> [,to <instname> <instpin>...] ; 

wire is the mandatory declaration of a wire.

instname identifies the instance of the wire endpoint. It must be one of the following: -name of an instance in this module; -my, indicating that the wire endpoint is in this module's input or output list. -his or her, indicating that the wire endpoint is in the most-recently declared instance.

instpin must match the name of a pin in instname's input or output list. If the instname is my, it may also be one of: -vcc for power wires -gnd for ground wires

to is an optional separator.

A wire may connect an outgoing endpoint to any number of incoming endpoints. The syntax is designed for readability. Here are some examples of wiring:

wire my vcc to lut's IN0, lut's IN1, lut's IN2;
wire his OUT to my IN;

Wire declarations may refer to scalar wires or wire buses (declared as name:width in the appropriate module). A scalar wire may be wired to another scalar wire or a bus, in which case it is wired to every wire of a bus. A bus must be wired to another bus of the same width.

Documentation Table Of Contents Home