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7 .- Field Programmable Gate Arrays FPGA

When complegidad programmable gate array increases then called the ASIC and FPGA, and this is the only difference between PLD'sy the FPGA, in fact some companies that manufacture FPGA ASIC's called a complex PLD products [4]. The FPGA is one of the newest members of the family of ASIC's, its importance grew rapidly replacing the use of TTL family in microelectronic systems. Some features of this type of ASIC's are:

• None of the masks are configurable by the consumer.
• a method is used to program the interconnections and the basic logic cells.
• The nucleus is a regular array of basic logic cells that can be implemented as a sequential logic based flip-flop's.
• An array of programmable interconnections surrounding the logic cells.
• cells surrounding the core programmable device.
• design takes only a few hours.