| 摘要 |
PURPOSE:To enable a CPU to detect the congestion of packet buffer early, by providing a buffer congestion monitor section for a CCE (communication controller) for the self-monitor and information. CONSTITUTION:A CPU 1 informs a number of use of buffer to a buffer congestion monitor section 5 via a block transfer control section 4 and stores the value to a memory in the section 5. When the section 5 detects that the number of buffer usage reaches a prescribed value or over, the section 5 requests the information of the buffer congestion to the CPU 1 for the section 4. When the CPU 1 receives interruption from a CCE2 and the information of buffer congestion, the CPU 1 gives instruction of the information of the number of buffer usage. The section 4 follows the instruction, receives the report of the number of buffer usage from the buffer congestion monitor section 5 and informs the CPU 1 of it. The CPU 1 checks whether or not the number of usage exceeds a prescribed number every time the information is received and if the CPU 1 exceeds continuously for a prescribed number of times, the input restriction packet is transmitted. |
