Input/output controller circuit using a single transceiver to serve multiple input/output ports and method therefor
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United States of America Patent
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-
May 16, 1995
Issued Date -
N/A
app pub date -
Oct 16, 1992
filing date -
Sep 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An input/output (I/O) controller uses a single transceiver to service multiple I/O ports in a small computer system, such as an IBM PS/2 computer. Arbitration logic controls the access of the ports to the transceiver, and once the arbitration logic directs one of the ports to the transceiver, all other I/O devices are locked out until the transfer to or from the current I/O device is complete. Once the current transfer is complete, the arbitration logic then goes back to arbitrating, looking for the next I/O device that needs service. The associated circuitry to implement the arbitration and control logic is much smaller than the circuitry required for an additional transceiver, resulting in a lower system cost.
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