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Overview

Ideal for printers, scanners, tape drives, set-top boxes, and data acquisition applications, the CD1284 is a multi-function interface controller that implements a high-speed, multi-protocol parallel port and two asynchronous serial ports. The device has both programmed I/O and DMA operation (parallel port only), providing flexibility in local CPU interface design and high-speed data transfers between the device and main memory.

Product Features

Parallel Port (Peripheral-side)

High-speed, bidirectional, multi-protocol parallel port:

■ Hardware implementation of all modes of the IEEE STD (Standard) 1284 specification (including automatic negotiation)

—Centronics? -compatible mode

—Reverse Byte mode

—Reverse Nibble mode

—ECP (extended capabilities port) mode with run-length encoding/decoding

—EPP (enhanced parallel port) mode

—Up to 2-Mbytes/sec. transfer rate in ECP and EPP modes

■ 64-byte parallel FIFO with DMA interface

Two Serial UARTs

■ Serial channel asynchronous protocol support to 115.2 kbps (register-setcompatible and functionally identical to CD1400)

—Twelve-byte FIFOs for each transmitter and receiver with programmable threshold for receive FIFO interrupt generation

—Improved interrupt schemes: Good Data? interrupts eliminate the need for character status check

—User-programmable and automatic flow control for serial channels

—Special character recognition and generation.

—Special character processing, particularly useful for UNIX? environments, optionally handled automatically by the serial channels.

—Six modem control signals per channel (DTR, DSR, RTS, CTS, CD, and RI)