ispLSI® 3256E Series, CPLDs (Complex Programmable Logic Devices)

Embedded-CPLDs (Complex Programmable Logic Devices) are a type of integrated circuit that combines the flexibility of programmable logic with the integration advantages of an embedded system. They are designed to provide configurable logic and routing resources within a single chip, allowing for the implementation of custom digital logic functions and interconnections in embedded systems. Functionality and Features: Embedded-CPLDs consist of an array of configurable logic blocks and programmable interconnects, along with input/output blocks and dedicated macrocells. These components can be programmed to create custom digital circuits, such as combinatorial and sequential logic, state machines, and specialized interfaces. The key features and functionalities of Embedded-CPLDs include: Configurable Logic: Embedded-CPLDs offer a grid of programmable logic elements that can be configured to perform a wide range of digital logic functions. This allows designers to implement custom logic circuits tailored to the requirements of the embedded system. Programmable Interconnect: The interconnect resources within CPLDs enable the flexible routing of signals between the configurable logic elements, I/O blocks, and other components. This programmable interconnect facilitates the creation of complex signal paths and connectivity within the device. Macrocells: Dedicated macrocells within Embedded-CPLDs provide additional functionality, such as flip-flops, latches, and product-term logic, enabling the implementation of sequential and registered logic. I/O Blocks: These blocks interface the CPLD with external devices and peripherals, providing a means to connect the programmable logic to the rest of the embedded system. Non-volatile Configuration: Once programmed, the configuration of an Embedded-CPLD is non-volatile, meaning that it retains its programmed logic and interconnect configuration even when power is removed. This feature eliminates the need for reprogramming at power-up, enhancing reliability and ease of use. Usage Scenarios: Embedded-CPLDs find applications in a variety of embedded systems and electronic devices, including but not limited to: Interface Control: They can be used to implement custom interfaces and protocol converters, enabling seamless communication between different parts of an embedded system or between diverse external devices. System Control and Management: Embedded-CPLDs are employed for system-level control and management functions, including power sequencing, reset generation, clock distribution, and bus arbitration. Signal Processing: In applications requiring digital signal processing (DSP) or data manipulation, Embedded-CPLDs can be used to implement custom algorithms and signal processing functions. Logic Integration: They are utilized to integrate diverse digital logic functions, such as glue logic, state machines, and control logic, into a single chip, reducing component count and board space. Custom Peripheral Implementation: Embedded-CPLDs are employed to create custom peripheral interfaces, specialized controllers, and application-specific logic tailored to the requirements of the embedded system. In summary, Embedded-CPLDs are integrated circuits that combine configurable logic and routing resources within a single chip, offering flexibility and customization in embedded systems. They find applications in interface control, system management, signal processing, logic integration, and custom peripheral implementation across various embedded system designs.