Low Profile PCI Express 4-Port

7402e - Sealevel Systems, Inc.

The 7402e low profile PCI Express serial interface provides four serial ports, each individually field-configurable for RS-422 or RS-485 communications. The board uses a 16C954 UART with 128-byte Tx/Rx FIFOs that enables data rates to 921.6K bps for reliable high-speed communications in data intensive applications. This high-performance UART includes 9-bit framing support and is register compatible with legacy 16550 software applications. In addition, the board derives a 62.5 MHz clock from the PCI Express link. This ultra-high speed clock is divided by a flexible 8-bit clock prescalar with 1/8 steps to provide support for the widest range of standard and non-standard baud rates.