Patent ID: 6775714
Filing Date: 2004-08-10
Classification: H04L

Abstract:
A method for performing a locking transaction between apparatuses connected through a predetermined serial communication bus, wherein a register conditionally writable is mounted in a predetermined apparatus connected through said serial communication bus and it is intended to write in said apparatus having said register through said bus from other apparatus, said method comprising the steps of:requesting said locking transaction with a value supposed to have been written in said register and a value to be written into said register, responding to the request with a current value of said register, updating the value of said register when said value supposed to have been written in the register is identical to said current value in the register, and preparing a value for said value supposed to have been written for a next locking transaction by assigning the updated value when the locking transaction succeeds and assigning the responded value when the locking transaction fails.