LOCK TRANSFER CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent a system bus from stacking when transfer is temporarily interrupted while the lock transfer of a local bus is executed on a lock transfer control system in a multi-processor system connected to the system bus executing split transfer through a bus interface circuit to which respective processors are connected through the local bus executing interlock transfer. SOLUTION: The transmission control part 2 of the bus interface circuit 1 is provided with a system bus lock signal generation part 2a generating a system bus lock signal to the system bus 4 with a signal showing a lock transfer request and a signal showing the use permission of the system bus at the time of access from the local bus 3 to the system bus 4. Even of the OFF of the lock signal due to the interruption of access by the local bus 3, a signal for suppressing the interruption if the system bus lock signal is generated from a mask signal generation part 2a and the system bus lock signal is outputted even if access is resumed.