The VPU16550 is designed to operate without any extra glue-logic and combined with a crystal, an E² and a suitable transceiver, it forms a complete serial port device compatible with industry standard "COM" ports.
To enhance the flexibility of the device, a number of special modes are provided including a general purpose digital I/O port, and a means to access the UART's TX/RX data characters via a simple parallel port.
PC Card digital audio is also supported to make modem dial sounds easy to implement in a PC Card compliant manner, typically using a single output pin from the modem micro-controller.
A clear advantage to using the VPU16550 is the Operating System level compatibility that the 16550 architecture brings.
The creation of the VPU16550 has evolved as a direct result of the expansion of Elan's Custom Design services, developing specialist PC Cards for a wide variety of industrial applications, and now enables other PC Card designers to benefit from Elan's experience in this field.