UARTlite vs. UART 16550: A Detailed Comparison

UART (Universal Asynchronous Receiver-Transmitter) is a common hardware device for serial communication in computers and embedded systems. UARTlite and UART 16550 are two different UART implementations with key distinctions.

What is UARTlite?

UARTlite is a simplified UART core designed for basic serial communication while minimizing resource usage. It may lack advanced features found in more complex UART implementations. Key features include:

• Buffering: May or may not include buffering capabilities. Simpler implementations might have minimal or no buffering.
• Interrupt Support: Depending on the specific implementation, UARTlite may or may not support interrupts. Interrupts are mechanisms that allow the UART to notify the CPU when certain events (such as receiving or transmitting data) occur.
• Resource Usage: Designed to be lightweight in terms of resource usage. It’s suitable for applications where resource constraints are a concern.
• Applications: Often used in applications where simplicity and low resource usage are prioritized, such as in small embedded systems or FPGA-based designs.

What is UART 16550?

The UART 16550 is a more advanced and feature-rich UART controller. It includes a FIFO (First-In-First-Out) buffer to store incoming and outgoing data, which helps reduce the load on the CPU during data transfer. It typically supports higher baud rates and has additional features like interrupt capabilities. Key features include:

• Buffering: Includes FIFO buffers for both incoming and outgoing data. This buffer helps reduce the likelihood of data loss or corruption, especially in high-speed communication scenarios.
• Interrupt Support: Typically supports interrupts. Interrupts are essential for efficient serial communication, as they allow the CPU to perform other tasks while waiting for data to arrive or be sent.
• Resource Usage: More resource-intensive compared to UARTlite due to its additional features such as FIFO buffers and interrupt support.
• Applications: Suitable for applications requiring higher data throughput, more robust communication, and advanced features like interrupt-driven communication. It’s commonly found in personal computers, industrial equipment, and other systems requiring reliable serial communication.

Difference between UARTlite and UART 16550

Conclusion

In summary, UARTlite and UART 16550 are two different UART implementations with varying levels of features and complexity. The choice between them depends on the specific requirements of the application, including factors such as resource constraints, desired functionality, and performance requirements.