16c95x Serial Port Driver Page

The 16C95x family (e.g., TI’s TL16C754, Exar’s XR16C95x) is a high-performance UART with FIFO depths up to 128 bytes, automatic hardware/software flow control, and multiple channels (often 4). The driver enables communication via RS-232/RS-485 in industrial, telecom, or embedded systems.

The Universal Asynchronous Receiver-Transmitter (UART) remains one of the most enduring interfaces in computing, from legacy RS-232 ports to modern industrial IoT gateways. Among UART controllers, the 16C95x family (including variants like 16C950, 16C952, and 16C954) stands out as a high-performance descendant of the iconic 16550. However, its advanced features—such as large transmit/receive FIFOs (up to 128 bytes per channel), automatic hardware flow control, and I²C/SPI expansion interfaces—demand a driver architecture far more sophisticated than the classic 8250/16550 driver. This essay analyzes the design, core responsibilities, and optimization strategies of a 16C95x serial port driver within the Linux kernel, arguing that it represents a crucial evolution in handling high-throughput, low-latency serial communication without sacrificing compatibility.

The 16C95x series is not a single chip but a family of high-performance UARTs. Key members include: 16c95x serial port driver

Common features:

These enhancements allow a driver to service interrupts much less frequently while sustaining high data rates, reducing context switching and CPU load. The 16C95x family (e

Excellent choice for high-speed, multi-channel serial needs if:

Avoid if you need extreme low power or very simple 9600 bps-only systems (a basic 16550A suffices). Common features:

Rating: 4/5 – Powerful but requires careful driver configuration to unlock its potential.