Adapter-bus switch for improving the availability of a control u

Details Adapter-bus switch for improving the availability of a control u Adapter-bus switch for improving the availability of a control u

1990-08-30

1992-08-18

Kriess, Kevin A.

Excavating

371 91, 364DIG1, 3642322, 364268, 3642683, 364247, 3642478, G06F 1116

Patent

active

051406918

ABSTRACT:
A Control Unit is described, including a Processing Unit (12) controlled by a Service Processor (14), and a plurality of adapters (18) exchanging data and/or control signals with said Processing Unit (PU). For ensuring a continuous operation of the Control Unit, the adapters are partitioned into at least two sets (56,58), and the PU is partitioned into at least two parts (26,28), each set of adapters being connected to a dedicated PU part by a primary bus (52,54). Besides, in order to allow the fallback of a set of adapters onto another PU part if the PU part to which it is normally connected is inoperative, a bus switching device (30) is provided. This bus switching device includes at least two Switch parts (38,40), and each Switch part performs the switching of a given set of adapters onto a given PU part, according to the status of each PU part. Therefore, each Switch part is connected to a given set of adapters by a primary bus (52,54), and to the other sets of adapters by secondary busses (46,48) which become active in fallback mode.

REFERENCES:
patent: 3882455 (1975-05-01), Heck et al.
patent: 4610013 (1986-09-01), Long et al.
patent: 4633467 (1986-12-01), Abel et al.
patent: 4684885 (1987-08-01), Chapman et al.
patent: 4823256 (1989-04-01), Bishop et al.
IBM Technical Disclosure Bulletin, vol. 25, No. 11B, Apr. 1983 pp. 6109-6110.

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