DESCRIPTION

The Philips Semiconductors SCN2661 EPCI is a universal synchronous/asynchronous data communications controller chip that is an enhanced version of the SCN2651. It interfaces easily to all 8-bit and 16-bit microprocessors and may be used in a polled or interrupt driven system environment. The SCN2661 accepts programmed instructions from the microprocessor while supporting many serial data communications disciplines —synchronous and asynchronous — in the full- or half-duplex mode. Special support for BISYNC is provided.

FEATURES

• Synchronous operation

– 5- to 8-bit characters plus parity

– Single or double SYN operation

– Internal or external character synchronization

– Transparent or non-transparent mode

– Transparent mode DLE stuffing (Tx) and detection (Rx)

– Automatic SYN or DLE-SYN insertion SYN, DLE and DLESYN 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 plus parity

– 1, 1-1/2 or 2 stop bits transmitted

– Odd, even, or no parity

– Parity, overrun and framing error detection

– Line break detection and generation

– False start bit detection

– Automatic serial echo mode (echoplex)

– 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

• 3 baud rate sets

• 16 internal rates for each set

• Double-buffered transmitter and receiver

• Dynamic character length switching

• Full- or half-duplex operation

• TTL compatible inputs and outputs

• RxC and TxC pins are short-circuit protected

• Single +5V power supply

• No system clock required

APPLICATIONS

• Intelligent terminals

• Network processors

• Front-end processors

• Remote data concentrators

• Computer-to-computer links

• Serial peripherals

• BISYNC adaptors