DESCRIPTION
The Philips Semiconductors SCN2651 PCI is a universal synchronous/asynchronous data communications controller chip designed for microcomputer systems. It interfaces directly to the Philips Semiconductors SCN2650 microprocessor and may be used in a polled or interrupt driven system environment. The SCN2651 accepts programmed instructions from the microprocessor and supports many serial data communication disciplines, synchronous and asynchronous, in the full or half-duplex mode.

FEATURES
• Synchronous operation
    – 5- to 8-bit characters
    – Single or double SYN operation
    – Internal character synchronization
    – Transparent or non-transparent mode
    – Automatic SYN or DLE-SYN insertion
    – SYN or DLE stripping
    – Odd, even, or no parity
    – Local or remote maintenance loopback mode
    – Baud rate: DC to 1Mbps (1X clock)
• Asynchronous operation
    – 5- to 8-bit characters
    – 1, 1-1/2 or 2 stop bits
    – Odd, even, or no parity
    – Parity, overrun and framing error detection
    – Line break detection and generation
    – False start bit detection
    – Automatic serial echo mode
    – Local or remote maintenance loopback mode
    – Baud rate: DC to 1Mbps
        (1X clock)
        DC to 62.5kbps (16X clock)
        DC to 15.625kbps
        (64X clock)

OTHER FEATURES
• Internal or external baud rate clock
• 16 internal rates – 50 to 19,200 baud
• Double buffered transmitter and receiver
• Full or half duplex operation
• TTL compatible inputs and outputs
• Single 5V power supply
• No system clock required
• 28-pin dual in-line package

APPLICATIONS
• Intelligent terminals
• Network processors
• Front-end processors
• Remote data concentrators
• Computer to computer links
• Serial peripherals