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The JBits ™ software is a set of Java ™ classes which provide an Application Programming Interface (API) to access the Xilinx FPGA bitstream. The interface operates on either bitstreams generated by Xilinx design tools, or on bitstreams read back from actual hardware. This permits all configurable resources like Look-up tables, routing and the flip-flops in the FPGA to be individually configured under software control. The API has been used to construct complete circuits and to modify existing circuits. In addition, the object-oriented support in the Java programming language has permitted a small library of parameterizable, object oriented macro circuits or Cores to be implemented. Finally, this API may be used as a base to construct other tools. This includes traditional design tools for performing tasks such as circuit placement and routing, as well as application specific tools to perform more narrowly defined tasks. The circuits developed can be downloaded on to the Xilinx hardware and probed using BoardScope. BoardScope is a graphical and interactive hardware debug tool for Xilinx FPGAs. It enables a user to look inside the chips and see the internal states and circuit configurations while the hardware is operating. The data is sampled using the readback capabilities of the FPGAs, and then graphically displayed. The interface to the hardware is provided by XHWIF, the Xilinx standard HardWare InterFace for FPGA based