Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Patent
1998-09-30
2000-11-07
Shin, Christopher B.
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
710 2, 710126, 710129, 714 25, 714 48, G06F 1300, G06F 1100
Patent
active
061450367
ABSTRACT:
Polling of devices on an inter-IC (I.sup.2 C) is provided. An expansion processor resides on a primary I.sup.2 C bus. The expansion processor is coupled to a plurality of I.sup.2 C sub-buses each of which may host a plurality of I.sup.2 C devices. Data is transferred between the expansion processor and the plurality of I.sup.2 C devices via the corresponding sub-bus according to an I.sup.2 C protocol. Data transfer is in response to a request initiated by a bus master on the primary I.sup.2 C bus. The bus master communicates with a target device residing on one of the sub-buses by addressing the expansion processor. The bus master informs the expansion processor of the target device by sending the expansion processor a number of the sub-bus on which the target device resides, and an address of the target device. A data stream bound for the target device is directed to the expansion processor which then echos it to the target device. Likewise, a data stream bound from the target device to the bus master on the primary I.sup.2 C bus is transmitted to the expansion processor which then echos it to the bus master. Each of the target devices on the sub-bus can be polled to determine if they have failed. Failure of a device only affects operation of its sub-bus.
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Barenys Michael Anton
Genz Curtis Ray
Goodwin Joel Gerard
Gray Forrest Clifton
International Business Machines Corp.
Kordzik Kelly K.
Shin Christopher B.
Van Leeuwen Leslie A.
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