| 摘要 |
PROBLEM TO BE SOLVED: To analyze many different packet network protocols by preparing an electronic look-up table which analyzes at least a part of a data packet and outputs the signals, including a statistical information signal. SOLUTION: A simplified protocol analyzer 15 includes an input buffer 18, an address generator 52, a comparison register 54, a mask 56 and an ASM (algorithm state machine) 20. The buffer 18 receives an input from a bus 16 via a line 17 and selects the frame headers from every frame to send them to a frame header buffer. The protocol decision algorithms are programmed in a CAM 62 and an ASM RAM 64 and successively check various fields of frames to decide the type of a protocol. Then a look-up table using the ASM 20 is produced and utilizes the CAM 62 to quickly identify a long data part.
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