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

PROBLEM TO BE SOLVED: To simply configure a multiplexer 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. SOLUTION: The byte 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.