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Chapter 2: Developing Video Applications In System Generator
R
video memory at reduced video clock rates. Although software simulation is not as fast as
real-time hardware operation, Simulink provides a quick and facile method of developing
and testing video processing functions. In addition, standard video processing functions
available for Simulink, such as the Image Processing Toolbox, allow video processing
functions to be quickly prototyped and tested.
Real-Time
Video
Video
Starter
Kit
Video Function
in Simulink
ug217_ch2_04_112905
Figure 2-6: Software Simulation Using Live Video Signals with Simulink
The infrastructure required to source and sink video streams from the VSK to the Simulink
simulation is provided by the Xilinx System Generator co-simulation feature, which allows
simulation diagrams to communicate directly with hardware. System Generator also
provides the ability to simulate flowgraphs constructed from Xilinx Blockset components,
as well as VHDL and Verilog black boxes using HDL simulators such as ModelSim.
Hardware-Software Systems
Video systems often require a control processor. The processor typically is used to
communicate with a host system, set up video processing operations, compute coefficients
and generally operate as a low rate data processor. Xilinx System Generator and the
Embedded Development Kit (EDK) software tools can be used together to implement and
simulate a system with a processor and FPGA video processor functions operating on live
video streams.
Generating a Video Processor as an EDK Pcore
The Xilinx EDK can be used to construct processor systems with integrated memory and
peripherals. Processor peripherals, such as memory and Ethernet interfaces, can be
included into EDK projects and are known as processor cores or pcores . Xilinx System
Generator can be used to generate custom pcores for functions such as video processing.
Figure 2-7 illustrates a processor system with standard and custom peripherals. The
processor is used to configure the video processing pipeline, and video data is passed
directly between stages of the video pipeline. This particular configuration with three
custom pcores is used for the VSK camera processing demo, VSK, and the VSK diagnostics.
Internal
Memory
MicroBlaze
Video I/O
Video
Processor
Ethernet
RS232
DDR Memory
Custom
Video Processor
Standard Peripherals
Microprocesor
Custom Peripherials
ug217_ch2_05_112905
Figure 2-7: MicroBlaze Processor with Peripherals and Three Custom
Video Peripherals
30
www.xilinx.com
Video Starter Kit
UG217 (v1.5) October 26, 2006
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