BUS ARBITRATION METHOD BETWEEN MULTI STAGE COMMON BUSES

摘要

initializing a significant common bus transmission constant unit, if a reset signal is detected; if the reset signal is not detected, checking whether a module state is changable or not; when the module is changable during its operation, if a synchronous frame signal is detected, initializing the significant common bus transmission constant unit, but when the module is not changed during its operation, if the synchronous frame signal is not detected, checking whether a use of the significant common bus is a reserved or not through the other module; if the reservation is performed, completing the system, but if it is not performed, comparing a value of the significant common bus transmission constant unit with the own module number; in the result of the comparison, if the result is different from each other, repeating the operation of the system, but if the result is the same, checking whether a use for a less significant common bus is booked or not; if the use is not booked, completing the operation of the system, but if the use is booked, informing that the use of less significant common bus is booked and then detecting whether or not the module of the significant common bus is the most significant module when the significant common bus is not used; if it is not the most significant module, repeatedly transmitting the frame from the significant module, but if it is the most significant module, starting to use the significant common bus; and completing all the operations of the system.