CPLD vs FPGA: Architechture, Price and Application

CPLD (Complex Programmable Logic Device) and FPGA (Field-Programmable Gate Array) are both types of programmable logic devices used in digital circuits. While they have similarities, there are differences in terms of architecture, price, and application.

Architecture:

1. CPLD: A CPLD consists of multiple Macrocells, which are programmable logic blocks that can be configured to perform desired functions. It also has programmable interconnects that connect the Macrocells. CPLDs have a hierarchical structure, making them suitable for small to medium complexity designs.

2. FPGA: An FPGA consists of a large number of configurable logic blocks, typically arranged in a grid-like structure. These logic blocks can be configured to implement various digital functions. FPGAs also have programmable interconnects, allowing for flexible routing between logic blocks. FPGAs are known for their high logic capacity and are suitable for complex designs.

Price:

1. CPLD: CPLDs are generally less expensive than FPGAs. They are often used in cost-sensitive applications where the complexity of the design is relatively low.

2. FPGA: FPGAs tend to be more expensive than CPLDs due to their higher logic capacity and flexibility. They are used in applications that require high-performance and complex designs.

Application:

1. CPLD: CPLDs are suitable for applications that require relatively small logic capacity and simple timing requirements. They are often used in glue logic, interface bridging, and control applications such as motor control and I/O expansion.

2. FPGA: FPGAs are widely used in various applications that demand high-performance and complex designs. They are commonly used in digital signal processing, telecommunications, video processing, aerospace, and scientific research.

In summary, CPLDs are more affordable and suitable for smaller designs with simple timing requirements, while FPGAs offer higher logic capacity and flexibility, making them suitable for complex and performance-demanding applications.

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