COMMON METHOD CONTROL SYSTEM OF MULTICOMPUTER SYSTEM

摘要

PURPOSE:To attain the control of resources with software by locking the mutual relation of data to prevent fetching of these data via an internal bus in case a master device is processing one of data stored in a common memory. CONSTITUTION:A master device 20 outputs a bus busy signal 13 to occuply a system bus 9, then transmits a memory drive signal 8 and an address signal to obtin desired data from a common memory 5. A clock signal generating circuit 14 receives signals 13 and 8 to output a signal 15 to prevent a CPU1 from accessing to the memory 5 via an internal bus 3 and locks the accesses fed to a common memory access control circuit 7. The circuit 7 outputs a common memory access signal 6 to the memory 5 to erase the signal 8. Thus the device 20 receives data. The signal 13 is outputted continuously while the device 20 is processing data. At the same time, the lock signal 15 is maintained.