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Embedded - CPLDs (Complex Programmable Logic Devices)

The EPM7064AEFC100-10 from Altera is one such example of a complex programmable logic device - usually referred to as a CPLD. CPLDs are integrated circuits that are used to implement complex digital logic functions and can range in complexity from a few hundred to millions of gates. They are similar to FPGAs, but have smaller logic capacities, shorter programming times and cost less.

Application Field

The EPM7064AEFC100-10 is extremely useful in a broad range of embedded applications where logic is required. Embedded products that require logic tasks such as system implementation, sensor interfacing, and remapping of data can benefit from the use of a CPLD, such as this Altera device. Additionally, with its built-in flash memory, the EPM7064AEFC100-10 can be used to store configuration information, run tests, and automate the system during reboot and start-up, making it an ideal choice for embedded systems.

Working Principle

The working principle of this CPLD model is quite simple: like FPGAs, it contains a large number of gates, but unlike FPGAs, it does not require programming to configure the gates. Instead, each gate has a specific purpose that can be configured to suit the application requirement. This is possible due to the integrated logic blocks known as columnar segments, which are made up of programmable logic elements and interconnects that can be used to customize the device’s function. Once programmed, each columnar segment can be used to implement complex digital logic functions, such as addition, subtraction, logical operations and data remapping, while still performing its primary purpose.

Once programmed, the CPLD is programmed into an internal EEPROM that is used to store the logic configuration instructions. This allows the device to be powered off and powered back up again, restoring the programmed logic configuration. In addition to the EEPROM, the EPM7064AEFC100-10 can also be used to store configuration information in its built-in flash memory, which can be used to run tests, and automate the system during boot and start-up.

Conclusion

Complex programmable logic devices such as the EPM7064AEFC100-10 are extremely useful in embedded applications where logic is required. These devices are smaller and more affordable than FPGAs, but can still be used to implement complex digital logic functions and store configuration information. With the help of built-in flash memory, they can also be used to run tests, and automate the system during reboot and start-up.

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