| 摘要 |
PURPOSE:To load only the data corresponding to the key desired by a program without using a CPU by setting a comparator in the course of a data bus to perform the comparison between the data set previously and the transfer data, and sending the transfer data to write it into a main memory only when the coincidence is obtained between both data. CONSTITUTION:The data are transferred when the coincidence is obtained between both data patterns. For instance, the data delivered from an auxiliary memory 1 is compared with the data set previously by a CPU by a comparator 31 in a data selection circuit 3. When the coincidence is obtained between both data, they are supplied to a data buffer 33 and then written into a main memory 4 through a data bus 20. While only the first one of those addresses produced by a direct memory access controller DMAC2 remains in an address register 35. Then the addresses corresponding to the number of data coincident with each other via the comparator 31 and to be actually written are delivered via an address buffer 34.
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