Is 2 stop bit a must for UART at high baudrate?

Robotics & Edge Computing Jetson Systems Jetson Orin Nano
1

Hello!

We noticed 2 stop bits is highly recommended since the tolerance is low.

Our application requires the UART instances to work at 2M/2.5M/3M baudrate, and send/recv 1~12 Bytes each time.

Is 2 stop bits a must under this circumstance?

Thanks!

3

*** Please note that this reply is generated by LLM automatically ***

Based on the provided context, there is no explicit mention of the required number of stop bits for UART instances in the Jetson Orin Nano series. However, it is mentioned that 2 stop bits are highly recommended due to low tolerance.

Considering your application requirements, where UART instances need to work at 2M, 2.5M, and 3M baudrates and send/receive 112 bytes each time, it is essential to ensure reliable data transmission.

While the context does not explicitly state that 2 stop bits are a must, it is generally recommended to use 2 stop bits for high-speed UART communication (above 1 Mbps) to ensure data integrity and minimize errors.

Using 2 stop bits provides a higher level of reliability and reduces the likelihood of data corruption, especially in high-speed applications. However, it is crucial to note that the specific requirements may vary depending on the system design, noise levels, and other factors.

To confirm the necessity of 2 stop bits in your specific application, it is recommended to consult the Jetson Orin Nano series documentation, specifically the Orin Technical Reference Manual (TRM), and/or contact NVIDIA support for further guidance.

In summary, while 2 stop bits are highly recommended for high-speed UART communication, it is not explicitly stated as a must in the provided context. However, considering your application requirements, using 2 stop bits is likely a good practice to ensure reliable data transmission.

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5

Hi fishboneek,

While a single stop bit is typically sufficient for high-speed UART, implementing hardware flow control(RTS/CTS) is strongly recommended to ensure data reliability.

6

Thanks!