METHOD AND DEVICE FOR DETECTING LIVE LOCK AND ARBITRATION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To detect a live lock state allowing only a bus transaction of a certain device on a common bus to always become a retrial response and to cancel the state. ;SOLUTION: A bus transaction detection part 5 detects a bus master, a bus slave and an end format (retrial response or completion) of a bus transaction being executed on the common bus. When each of live lock detection parts 11A to 11D corresponding one of one to agents A to D detects a live lock state that only the bus transaction of the agent corresponding to the detection part itself always becomes a retrial response on the basis of the detection information of the bus transaction, each of the detection parts 11A to 11D requests a bus exclusive mode setting part 4 to allow only the corresponding agent to exclusively use the bus. The setting part 4 makes bus using requests REQA to REQD outputted from respective agents A to D and an arbiter 3 provides bus use right only to the agent concerned.;COPYRIGHT: (C)2000,JPO