The XR17xxx PCI and PCIe UARTs are designed for use in system boards or add-in cards. The 4-channel and 8-channel versions are pin compatible so a single design can support 4 or 8 ports depending on the end customer’s requirements. The 4-channel and 8-channel PCIe UARTs have a proprietary master/slave expansion bus interface that enables up to 16 ports on a single x1 PCIe lane. The XR17xxx PCI and PCIe UARTs are software compatible with the industry-standard 16550 UARTs. Native support for Exar’s PCI and PCIe UARTs is built-in to the latest Linux kernels. Custom software drivers for Windows, Windows Server, Windows Embedded Compact, Linux, VxWorks and QNX are also available from Exar.

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