Access conflict prevention device between device board and device control board of exchanger

摘要

The present invention relates to a communication between a device board and a device control board in a switching system, and more particularly, to enable a common memory in a corresponding device board to be operated through a serial bus without causing an address collision phenomenon And an access collision avoidance apparatus between a device board and a device control board of one exchange.;Conventionally, the device control board repeatedly reads and writes the DRAM in the device board several times for accuracy of data recording. However, in the present invention, when the device control board is first accessed, the local logic unit notifies the CPU of the request signal In the first access of the device board, the CPU accesses the buffer by the enable signal and the interrupt signal through the interface to the busy signal of the DPRAM, and the DPARM It is possible to give priority to access to the corresponding DPRAM to the corresponding device control board to reduce the burden on the software of the corresponding device control board and to prevent a collision at the time of simultaneous access of the corresponding device board, thereby improving the performance of the system.