data flow diagram

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data flow diagram

[′dad·ə ¦flō ‚dī·ə‚gram]
(computer science)
A chart that traces the movement of data in a computer system and shows how the data is to be processed, using circles to represent data. Also known as bubble chart; system flowchart.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Data Flow Diagram

(programming)
A graphical notation used to describe how data flows between processes in a system. Data flow diagrams are an important tool of most structured analysis techniques.

http://smartdraw.com/resources/centers/software/dfd.htm.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

data flow diagram

A description of data and the manual and machine processing performed on the data as it moves and changes from one stage to the next. It also includes the locations where the data are placed in permanent storage (disk, tape, etc.).
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References in periodicals archive ?
I like to schedule reviews or walkthroughs at these points during development: after the requirements specification has been completed; after overview design is complete (usually a data flow model); after detail design is complete (process specifications for individual modules); after the test plan is written; and after coding has been done.
For example, you'll do things a little differently if your specification document is a written narrative or if it includes a data flow model of the problem being addressed.
There are, it seems, only a few ways for a relationship to be manifested in a data flow model. Containment is one way.
The purpose of the rule checker is to ensure that we have adequately addressed the consistency of the E-R and data flow models. If relationships in the E-R model are not represented in the data flow model, the rule checker will report this; we are then free to decide that the situation is acceptable or not, as the case may be.
Since we have been working with the data flow model, we first add the entity to an appropriate EDFD.
The difficult question is how to correlate state-transitions with the data flow model. The most obvious answer is to identify selected data flows with events.
The highest layer of functions in the data flow model (those lying just below the wavy line in Figure 2) are mapped by the design generator to degenerate objects.
Including such information in the data flow model would increase the overlap between that model and the state-transition model.
- SenML (used for data flow models to ensure higher efficiency of transmission).
The VCX-QP version FPGA is graphically programmable, with Visual Applets using data flow models. Existing FGPA hardware code--created with VHDL or Verilog--can also be integrated using VisualApplets Expert.
(A seventh runs in a special mode and is dedicated to aspects of the OS and security, and an eighth is disabled to improve production yields.) Each SPE can run a different program, and the internal communications allows programmers to arrange the data flow in different ways using parallel, pipelined or streamed processing data flow models.
The VCX-QP version FPGA is graphically programmable with VisualApplets using data flow models. Existing FGPA hardware code (created with VHDL or Verilog) can also be integrated using VisualApplets Expert.