p1076_chap_04

A signal may have one or more sources for a signal of

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: more sources. For a signal of a scalar type, each source is either a driver (see 12.6.1) or an out, inout, buffer, or linkage port of a component instance or of a block statement with which the signal is associated. For a signal of a composite type, each composite source is a collection of scalar sources, one for each scalar subelement of the signal. It is an error if, after the elaboration of a description, a signal has multiple sources and it is not a resolved signal. It is also an error if, after the elaboration of a description, a resolved signal has more sources than the number of elements in the index range of the type of the formal parameter of the resolution function associated with the resolved signal. If a subelement or slice of a resolved signal of composite type is associated as an actual in a port map aspect (either in a component instantiation statement, a block statement,12 or in a binding indication), and if the corresponding formal is of mode out, inout, buffer, or linkage, then every scalar subelement of that signal must be associated exactly once with such a formal in the same port map aspect, and the collection of the corresponding formal parts taken together constitute one source of the signal. If a resolved signal of c...
View Full Document

Ask a homework question - tutors are online