A data transfer control system for multiple units on a common bus using a serially transmitted transfer permission signal
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United States of America Patent
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-
Sep 11, 1984
Grant Date -
N/A
app pub date -
Feb 22, 1981
filing date -
Jun 22, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A data-transfer controlling system comprising a bus-control unit connected to a common bus for controlling data transfer through the bus and a plurality of transmitter/receiver units for transferring data through the common bus to each other. The bus is comprised of a transfer-request signal line connected to each of the transmitter/receiver units, one or two permission-signal lines, for permitting transfer of data by a transmitter/receiver unit which has been generating a transfer-request signal, an acknowledge signal line, and a transfer-end signal line. The bus does not include a busy-interlock signal line, which was included in the prior art. The transmitter/receiver unit which has received the permission signal begins to transfer data when both of the permission signal and the transfer-end signal are terminated.
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