Note: As of version 10.1.02, Xilinx has added a stable EDK export flow to System Generator. The new flow creates a PLB46 slave interface with access to registers, FIFOs and shared memory blocks in the user design. This flow completely replaces sysgen2opb and the OPB Export Tool. As a result, these tools are no longer maintained.

sysgen2opb Peripheral Conversion Tool

'sysgen2opb' is a MATLAB script which converts a model built in Xilinx System Generator into an OPB-compliant peripheral for use with the FPGA's embedded PowerPCs. The script replaces all the model's From/To Registers with memory mapped registers. It also creates the necessary address decode logic and a C header file with the resulting register map. This script is loosly based on Xilinx's application note xapp264.

Alternatively, if an addressable dual-port storage block is used within a System Generator model, the storage element may be mapped directly into the OPB memory space. This functionality, termed the Shared Memory Extension, permits higher throughput when accessing shared storage elements. This extension can be turned on/off. This extension requires the usage of Dual Port RAM's.

The latest copy of this tool is available in the repository.

A copy of Xilinx's OPB Export tool is needed to use the models generated by sysgen2opb.


Installing WARP MATLAB Toolbox

  • Download or SVN checkout everything from this repository directory
  • Copy it to C:\<MATLAB_DIR>\toolbox\WARP (where <MATLAB_DIR> is the root of your MATLAB installation)
  • Add C:\<MATLAB_DIR>\toolbox\WARP and its subdirectories to MATLAB's path

Using sysgen2opb

  1. In your model, add "To Registers" (Xilinx block) to a line if you want to be able to read its values by PowerPC (Read a register in C code)
  2. In your model, add "From Registers" (Xilinx block) to a line if you want to control an input to the system by PowerPC (Write a register in C code)
  3. Change MATLAB's current working directory to the folder containing your model
  4. Close your model
  5. On the MATLAB command line, run sysgen2opb('modelName')
  6. Your model should now be ready to be generated by the OPB Export Tool.


Current sysgen2opb Extensions

Current Limitations

  • The model you're converting must contain at least one RW Register and one RO Register.
  • The generated OPB interface must be clocked at the system sample period.
  • Every register created by the script will have a unique address on a 4-byte boundary (i.e. addr[1:0]=2'b0 for all).
  • The memory interface blocks created by the script will be placed in the middle of the top-level of the model, probably underneath existing subsystems. Connectivity won't be changed, but you'll have to clean things up by hand.
  • RO Registers do not support Boolean datatypes. You must cast signals to UFix1_0 before connecting the RO Register block.
  • Every path to a RO Register must contain synchronous elements (i.e. no purely combinational outputs).
Last modified 16 years ago Last modified on Aug 19, 2008, 10:39:37 PM