Xilinx provides a utility function for updating their blocks in upgrades of Simulink models. This function is called "xlUpdateModel" and is not part of the Mathworks products. For information on this function, please refer to the System Generator manual, and search for "xlUpdateModel".
MATLAB: How to use XLUPDATEMODEL provided by Xilinx System Generator to update the Simulink model that uses Xilinx System Generator blocks in Simulink 7.5 (R2010a)
simulinkxilinxxlupdatemodel
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