Programmable logic device (PLD) module operating device e.g. for digital printers and copiers, has PLD-module linked to host processor for loading program data into RAM-module for controlling microcontroller via data multiplexer

摘要

A device for operating a programmable logic device (PLD)-module in which the PLD-module (10) comprises a microcontroller (14), a data multiplexer(20) and an address-multiplexer (22). The PLD-module (10) can be linked to a host processor (12) which, in the loading phase, loads program data for controlling the micro-controller (14) via the data multiplexer (20). The host processor, controlled by the address-multiplexer (22), loads program data into the RAM-module (24), and in an operating phase the micro-controller (14) accesses program data in the RAM-module (24) with switch-on of the data multiplexer (20) and the address multiplexer (22). Independent claims are included for the following ; (1) a method of operating a data processing system ; (2) a device for operating a data processing system.