I/O Channel bus

Details I/O Channel bus I/O Channel bus

1982-09-28

1986-01-14

Heckler, Thomas M.

Boots, shoes, and leggings

G06F 300

Patent

active

045648999

ABSTRACT:
A data bus system utilizing logical transfer channels provides high data rates (even over long distances) and good error detection. The basic function of a transfer channel is to enable temporary assignment of some portion of the bus resource to a specific device and then to allow simple, quick addressing of that device by reference to that channel. There are a relatively small number of transfer channels (say four) that may be attached or detached by the channel processor (IOCP) to meet the data flow requirements. For a transfer to occur between the IOCP (15) and a device (30a, 30b), the IOCP (15) first effects an "attach" operation to assign the device (30a, 30b) a transfer channel for the duration of the transfer. Thereafter, the IOCP (15) allocates the bus cycles among the currently attached transfer channels according to any desired priority scheme, subject to the constraint that the device on a transfer channel be ready to send or receive data before that transfer channel may be granted cycles.

REFERENCES:
patent: 3787627 (1974-01-01), Abramson et al.
patent: 3798613 (1974-03-01), Edstrom et al.
patent: 3810105 (1974-05-01), England
patent: 4038641 (1977-07-01), Bouknecht
patent: 4110830 (1978-08-01), Krygowski
patent: 4228496 (1980-10-01), Katzman et al.
patent: 4246637 (1981-01-01), Brown et al.
patent: 4320457 (1982-03-01), Tanikawa

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