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FPGA(Field-Programmable Gate Array), which is a field-programmable gate array, which is a product of further development based on programmable devices such as PAL, GAL, and CPLD. It is used as an ASICASICThe emergence of a semi-custom circuit in the field not only solves the shortcomings of the custom circuit, but also overcomes the shortcomings of the limited number of original programmable device gates.
Field programmable gate arrays are integrated circuits designed to be configured by the customer or post-manufacturer designer - hence the term "field programmable". FPGA configurations are typically specified using hardware description language (HDL), similar to the language used in application specific integrated circuits (ASICs). Circuit diagrams were previously used to specify configurations, but this is becoming less common due to the advent of electronic design automation tools.
Xilinx's Spartan FPGAs contain a series of programmable logic blocks and reconfigurable interconnect levels that allow blocks to be "joined together", just like many logic gates that can be interconnected in different configurations. Logic blocks can be configured to perform complex combination functions, or simply simple logic gates such as AND and XOR. In most FPGAs, the logic block also includes memory elements, which can be simple flip-flops or more complete memory blocks. Many FPGAs can be reprogrammed to implement different logic functions, allowing flexible reconfigurable calculations to be performed in computer software.