
HDFFSMDirector |
ptolemy.domains.hdf.kernel.HDFFSMDirector |
This director extends MultirateFSMDirector by restricting that state
transitions could only occur between global iterations.
The choice and commitment of the transition is deferred by sending
a change request to the manager.
<p>
An HDFFSMDirector is often used in heterochronous dataflow (HDF) models.
The HDF model of computation is a generalization of synchronous dataflow
(SDF). In SDF, the set of port rates of an actor (called the rate
signatures) are constant. In HDF, however, rate signatures are allowed
to change between iterations of the HDF schedule. The change of rate
signatures can be modeled by state transitions of a modal model, in which
each state refinement infers a set of rate signatures.
<p>
<b>References</b>
<p>
<OL>
<LI>
A. Girault, B. Lee, and E. A. Lee,
``<A HREF="http://ptolemy.eecs.berkeley.edu/papers/98/starcharts">
Hierarchical Finite State Machines with Multiple Concurrency Models</A>,
'' April 13, 1998.</LI>
</ol>
Author(s): Ye Zhou. Contributor: Brian K. Vogel
Version:$Id: HDFFSMDirector.doc.html,v 1.1 2006/02/22 18:40:27 mangal Exp $
Pt.Proposed Rating:Red (zhouye)
Pt.Accepted Rating:Red (cxh)