PRE-PROCESSING METHOD FOR DATA PACKET RECEIVED VIA COMMUNICATION BUS BY BUS INTERFACE UNIT, THE BUS INTERFACE UNIT AND APPLICATION DATA PROCESSING UNIT

摘要

PURPOSE: A multiplexer is provided to simplify the configuration to rearrange byte sequence not by changing the byte sequence in a header data field but by changing the byte sequence in a payload data field. CONSTITUTION: The bate sequence in a header data field is not changed but the byte sequence in a payload data field is changed. A data link layer unit(21) automatically rearranges the byte sequence of an asynchronous data packet by means of the hardware. A corresponding multiplexer(24) rearranges the byte sequence under the control of a little endian flag(23). This flag is set while a data link layer IC(21) is initialized. This IC(21) is initialized after interruption of power by using a specific program working on an application processing unit(30).