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5 Logic Development Process

The FrameWork Logic system supports two logic development methods: VHDL, or MATLab

Simulink, or a combination. Each system offers benefits and have strengths that in some cases

complement each other.

VHDL development is very flexible, allowing the developer the full freedom of a high level

language that is expressive and extensible. The FrameWork Logic system provides VHDL

components for hardware interfaces that allow the designer to quickly integrate custom VHDL

code into the application logic. Other library components are offered that provide some common

functions used in signal processing and control. Libraries from Xilinx and third parties are also

used to provide broad support for signal processing, analytical and communications applications.

Development

Tool

Pro Con

VHDL Expressive, extensible language. Gives

complete flexibility to the designer.

Design and debug of DSP algorithms

is more difficult and time consuming.

MATLAB

Simulink

Allows design of complex DSP algorithms

at a high level. Great visualization and

analysis tools for design and debug.

Less capable of handling low-level

details. Less visibility and control of

logic design process.

VHDL +

MATLAB

Best of both tools gives optimum flexibility

where needed and high level design for

complex DSP algorithms.

Multiple tools must be used resulting

in a more complex development

process.

Table 3: Logic Environments Pros and Cons

MATLAB Simulink offers a high-level block diagram approach to logic design that allows the

designer to work at a higher, more abstract level. Signal processing algorithms can be quickly

developed and simulated in MATLAB then directly ported to the logic hardware. Inside of the

FrameWork Logic tools, the designer can concentrate on the algorithms because the system has

a hardware interface layer that integrates the hardware with MATLAB cleanly and efficiently.

Application development is dramatically sped up for complex signal processing algorithms

because of the powerful capabilities within MATLAB for algorithm design, visualization and

analysis.

Many applications find that a mix of VHDL and MATLAB offer the best of both worlds: high level

signal processing development and the full flexibility of a high level language. It is common that

unique data handling, triggering and interface functions may be better expressed in VHDL, but

nothing beats the power of MATLAB for things like filter design, down-conversion and

mathematical analysis of data. The designer can mix VHDL components, or MATLAB-generated

components with one another in either environment and reap the benefits of each system.

5.1 Developing Using VHDL

Application logic development with the FrameWork Logic in VHDL follows the typical development

cycle: code creation, simulation, physical implementation and test. This flow is summarized in the

following diagram showing the Xilinx ISE tools and ModelSim as the primary development tools.

Innovative Integration FrameWork Logic User Guide 9

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