说明：  The Synthetic PIC is a synthesizable VHDL description of the basic Microchip PIC 16C5X microcontroller. It is written in the ViewLogic VHDL environment (Workview PLUS 5.2). It has successfully been synthesized to the XC4000 family, although it is not particular to XILINX. The intent of the model is to provide a starting point for using the PIC architecture as a "core" for an FPGA, ASIC, etc. This model does not attempt to emulate the PIC with absolute fidelity, rather, it is a good starting point for spinning your own core.