1. Different logical structure.
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CPLD: Similar to PAL and GAL, it has rich combinational logic circuit resources.
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FPGA: similar to gate array, with rich trigger and memory resources; IP cores such as CPU and DSP.
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2, the integration is different.
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CPLD: 500 to 50000 doors
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3, the interconnection structure is different.
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CPLD: An interconnect resource of equal length, characterized by equal delay.
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FPGA: multi-segment distributed interconnection of varying lengths, which is characterized by flexible wiring, but the delay is related to the system layout and wiring.
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5, the particle size is different.
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The FPGA has a fine-grained structure and the CPLD has a coarse-grained structure.
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There are rich connection resources in FPGA, small CLB block, and high chip utilization. The macro unit of CPLD has a large and OR array, which usually cannot be fully applied, and the macro unit is mainly connected through high-speed data channel, and its capacity is limited, which limits the flexible wiring of the device, so the utilization rate of CPLD is lower than that of FPGA devices.
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6, the range of application is different.
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Digital logic systems fall into two broad categories:
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(1) Control intensive (logic-intensive), low requirements for data processing capabilities, but complex logical relations, more input and output, suitable for CPLD implementation.
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(2) Data-intensive, requiring a large amount of data processing capacity, but the logic is relatively simple, less input requirements, suitable for FPGA implementation.
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7. Different configurations.
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CPLD: Using EPROM, E2PROM process, directly write, good confidentiality.
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FPGA: The SRAM process is used, so a ROM chip is needed to store configuration letters
Both FPGA and CPLD are programmable logic devices, but there are some connections and differences between them.
The clear conclusion is that the two are different in structure and function, but there is some overlap in the application field; The reason is that they can complete the logical functions in the hardware design, but the FPGA usually integrates more resources and can achieve more complex designs. CPLD is relatively small, lower power consumption, more suitable for some simple logic design.
Can introduce some differences and advantages and disadvantages of FPGA and CPLD in application. For example, because FPGA has more resources and can support more complex functions, it is widely used in digital signal processing, computer vision and other fields. CPLD is more suitable for simple logic design such as pipeline control and timing control.
In addition, it can also introduce the differences between the two in terms of price, design complexity, etc.