MATLAB DESIGN HDL CODER RELEASE NOTES Guide de l'utilisateur télécharger pdf (Page 271)

System Generator for DSP User Guide www.xilinx.com 271

UG640 (v 12.2) July 23, 2010

Real-Time Signal Processing using Hardware Co-Simulation

Support for Coefficient Reloading

An interesting characteristic of the kernel data path is that its coefficients can be

dynamically reloaded at run-time. The 5x5 filter block includes Load and Coef control

ports, which are driven by the coefficient_memory subsystem.

The coefficient_memory contains a copy of the most recently loaded filter coefficients,

which are stored in an unprotected shared memory named coef_buffer. During run-

time, the subsystem monitors the shared memory contents, and initiates a reload sequence

if detects a change. By co-simulating the unprotected shared memory, any process on the

host PC may write new kernel coefficients simply by writing to a shared memory object

named coef_buffer. This interface is convenient, as communication with the FPGA

hardware is completely abstracted through the Shared Memory API.

Compiling for Hardware Co-simulation

The full filter kernel design must be compiled for hardware co-simulation before it can be

simulated.

5. Double click on the System Generator block located at the top of the

conv5x5_video_ex model.

6. Select an appropriate hardware co-simulation target.

7. Press the Generate button to compile the design for hardware co-simulation.

A hardware co-simulation block is created once the design finishes compiling.

Hardware co-simulation blocks include information about any shared memories, registers,

or FIFOs that were compiled as part of the design. You may view this information by

double-clicking on the hardware co-simulation block to open the parameters dialog box.

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MATLAB DESIGN HDL CODER RELEASE NOTES Guide de l'utilisateur Page 271