FPGA principle:
FPGA using a logic unit array LCA (Logic Cell Array) such a new concept, including the internal logic modules can be configured CLB (Configurable Logic Block), input output module IOB (Input Output Block) and internal connections (Interconnect) in three parts . The basic characteristics of FPGA are:
1) the FPGA design ASIC circuits, users do not need to vote in film production, the chip can be shared.
2) FPGA can do other full-custom or semi-custom ASIC circuits in the sample tablets.
3) FPGA internal rich Trigger and I / O pins.
4) FPGA ASIC is the shortest circuit design cycle, the lowest development costs, risk one of the smallest device.
5) FPGA using high-speed CHMOS technology, low power consumption, with CMOS, TTL-level compatible.
It can be said, FPGA chip is small batch system to enhance the system integration, reliability of one of the best choice.
FPGA is stored in RAM chip in the process to set up their work status and, therefore, need to work on the RAM chip programming. Users can configure different patterns, different programming methods.
Power-time, FPGA EPROM chips will read the data programmed into the chip RAM, after the completion of configuration, FPGA into the work of state. Power-down after, FPGA restore white film, the internal logic disappear, so, FPGA can be used repeatedly. FPGA programming do not have a dedicated FPGA programming, with only general EPROM, PROM programming is all you need. When the need to amend the FPGA functions, simply for an EPROM can be. In this way, with an FPGA, different programming data, can produce different circuits. Therefore, FPGA the use of very flexible.