The LPC bus, which replaced the ISA bus is a local bus found on system boards that connects to serial ports and other peripheral devices. Exar offers 2-channel and 4-channel LPC UARTs that are I/O mapped to traditional COM port addresses of 0x3F8, 0x2F8, 0x3E8 and 0x2E8 by default. If those addresses are not available, the BIOS can program other I/O addresses in the base address registers at boot-up. The UARTs in the XR28V38x are software compatible with the industry-standard 16550 and can use the standard serial port drivers found in almost all operating systems.

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