Overview

The MN86063 is a high-speed LSI codec for compressing and decompressing facsimile images. Features include real-time printing to laser printers, built-in line memory, enlargement and reduction, and code conversion.

特性 Features

? Pixels per line: between 16 and 4864 bits, in word (16-bit) increments.

? Processing time per line: Individual pixels are processed within two system clock cycles. For a machine cycle of 10 MHz, processing the worst-case pattern for a 4096-bit line takes no more than 1 ms.

? Time-shared, multiplex processing

Support for time-shared, multiplex processing allows image I/O, enlargement/reduction processing, and coding/decoding to proceed concurrently for a group of lines. Image bus DMA transfers can also proceed concurrently with command processing.

? Multiple channels

If lines consist of 2432 bits or fewer, commands can be processed simultaneously on two channels using time-sharing. These commands may be issued asynchronously.

? Bus configuration

There are separate system and image buses. The latter features two independent master DMA channels; the former, four slave DMA channel pins.

? Image data I/O

Image data I/O can use either the image or system bus.

? Byte conversion

When the system bus is 16 bits wide, the chip can swap the upper and lower bytes of image or coded data. It can also swap the MSB and LSB.

? Memory management

The chip includes pointer management for the image buffer connected to the image bus.

? Machine cycle

The limit is 10 MHz. This means that the maximum input clock is twice this, or 20 MHz.

Applications

? Facsimile equipment