pmc-423是什么啊？

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Overview
Introduction
The PMC423* is a versatile sixteen port serial controller in PCI Mezzanine Card
(PMC) format. Signaling characteristics of each port can be controlled for RS232,
RS422 or RS485 operations. The signaling protocol configuration is per four
channels, providing four independent configuration settings. The serial interfaces
are implemented using an Octal UART. This combines compatibility with the
most commonly used components (16C550 compatible register set), with full
support of PCI attributes (e.g., 32‐bit data transfers) for increased performance.
This allows rapid integration to legacy systems, while providing an evolutionary
path for enhanced software to improve performance.
Product Features
The PMC423 is a powerful and flexible method to integrate serial data channels to
a PCI system. Features include:
• Sixteen independent serial channels
• Progr