METHOD AND DEVICE FOR ENABLING CACHE STREAMING

PROBLEM TO BE SOLVED: To execute cache streaming by making cache memory that combines data bus approval signals transfer sequential information from the cache memory in response to a data bus approval signal without the intervention of a wait state in a cache streaming state. SOLUTION: A transfer approval state machine 301 in a data bus arbitrator circuit receives a transfer acknowledgment signal TA, a transfer start signal TS, a transfer type signal TT, a transfer burst signal TBST, etc., and inputs an output count state signal to a control state machine 303. Also, the machine 303 receives an L2 streaming detection signal LSD from an L2 streaming detection state machine 305 and a data bus approval signal DBG. Cache memory enables a cache streaming state in response to the signal DBG and becomes effective in transferring sequential information without the intervention of a wait state in this state.