| 摘要 |
PURPOSE:To search for mishit of a cash buffer at a high speed, by providing a storing circuit, etc. for a cash table, and deciding hit and mishit. CONSTITUTION:In accordance with access from an external device 401 such as a CPU, etc., a cash controlling part 402 sets the head address of each cash table, the head address of an area containing data calculated from an address from the device 401, the length of the cash table, etc. to an addressing circuit 406, a comparing register 407, and a table length circuit 409, respectively. Subsequently, the address of the circuit 406 is driven in order by a circuit 410, a page head address of a table storing circuit 405 is compared with contents of the register 407 by a comparing circuit 408. Unless coincidence by this comparison is generated before coinciding with the total number of driving the address through the circuit 410 in accordance with setting of the circuit 409, it is decided as mishit, it does not pass through the controlling part 402, therefore, mishit is searched quickly, and a cash buffer is utilized effectively. |
