System Generator 13.3 added support for bit
and cycle accurate, single, double and custom precision-floating-point on many blocks in the Xilinx Blockset. It now has a new "Floating-Point" library under "Xilinx Blockset" in the "Simulink Libary Browser", which lists all blocks supporting floating point numbers (see the "Floating Point Library in Xilinx Blockset" snapshot below).
