Basic Blocks

Conventions

The diagram parts are presented by their notation in Swan.

When an element is expected in its textual syntax in a diagram, it is noted with conventions described in Conventions.

Blocks

A block consumes flows (inputs) and/or produces flows (outputs). These flows are carried by wires connected to other blocks through ports. The ports are pins or buses.

A block is either:

• an expression block

  produces a flow expr is in textual syntax (see Expression)
  includes the case of a single identifier: input, local variable, constant

• a definition block:

  consumes a flow and defines a local variable or an output

• an operator instance block
  • predefined from the catalog
  • user defined
• a group block : to group, ungroup, reorder wires

Wires

A wire in a block diagram has a source and one or several targets. Thus, a wire is composed of a source port reference and several target port references.

• a source port reference is either

  a source pin
  or a source bus with possibly a group_adaptation

• a target port reference is either

  a target pin
  or a target bus with possibly a group_adaptation