Data transmission system which prefetches data to be transferred

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395425, 395275, 364DIG1, 3642384, 3642423, 36424231, 3642386, 3642391, 3642395, 36423951, G06F 1300

Patent

active

053882296

ABSTRACT:
In a data transmission device, before the starting of data transmission, a data conduct device detects an external bus, and an address comparator section compares the value of the address signal line with the output values of the parameter memory section. As the result of the comparison, when it is judged that the data to be transmitted is present on the external bus, the address comparator section transmits a write-execution signal to a bus control unit so that the bus control unit writes the data present on the external bus together with the validity bit thereof into the data memory device. In the period of data transmission, when the data assigned to the address produced by an address generator is present in the data memory device, the data is transmitted to the external destination, and on the other hand, when the data assigned to the address is absent in the data memory device, the bus control unit gains access to the external memory for obtaining the data corresponding to the address, so that the data obtained from the external memory is transmitted to the external destination.

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