10AX115H2F34E2SG FPGA Arria® 10 GX Family 1150000 Cells 20nm Technology 0.9V 1152-Pin FC-FBGA

CPLD is the abbreviation of complex programmable logic device,FPGA is the abbreviation of field programmable gate array, the function of the two is basically the same, but the implementation principle is slightly different, so we can sometimes ignore the difference between the two, collectively referred to as programmable logic device or CPLD/FPGA. There are several companies producing CPLD/ FPGas, the largest three being ALTERA,XILINX, and LAT-TICE. CPLD decomposition combinatorial logic function is very strong, a macro unit can decompose a dozen or even more than 20-30 combinatorial logic input. However, a LUT of FPGA can only handle the combinational logic of 4 inputs, so CPLD is suitable for designing complex combinational logic such as decoding. However, the manufacturing process of FPGA determines that the number of LUTs and triggers contained in the FPGA chip is very large, often thousands of thousands,CPLD can generally only achieve 512 logical units, and if the chip price is divided by the number of logical units, the average logical unit cost of FPGA is much lower than that of CPLD. So if a large number of triggers are used in the design, such as designing a complex timing logic, then using an FPGA is a good choice.

Although both FPGA and CPLD are programmable ASIC devices and have many common characteristics, due to the differences in the structure of CPLD and FPGA, they have their own characteristics:

• CPLD is more suitable for completing various algorithms and combinatorial logic, and FPGA is more suitable for completing sequential logic. In other words,FPGA is more suitable for flip-flop rich structure, while CPLD is more suitable for flip-flop limited and product term rich structure.
• The continuous routing structure of CPLD determines that its timing delay is uniform and predictable, while the segmented routing structure of FPGA determines that its delay is unpredictable.
• FPGA has more flexibility than CPLD in programming.
• CPLD is programmed by modifying the logic function of a fixed internal circuit, while FPGA is programmed by changing the wiring of the internal connection.
• Fpgas can be programmed under logic gates, while CPLDS are programmed under logic blocks.
• FPGA is more integrated than CPLD and has more complex wiring structure and logic implementation.

In general, the power consumption of CPLD is larger than that of FPGA, and the higher the integration degree, the more obvious.