Dynamic polling of devices for nonsynchronous channel connection

Details Dynamic polling of devices for nonsynchronous channel connection Dynamic polling of devices for nonsynchronous channel connection

1990-08-31

1993-04-06

Fleming, Michael R.

Boots, shoes, and leggings

395325, 364241, 3642411, 364DIG1, 3649401, 3649405, 364DIG2, 34082508, G06F 1300, G06F 1314

Patent

active

052010538

ABSTRACT:
A multi-path controller is disclosed for connecting CPU channels with DASD device subsystems. Extended channel connection time are accommodated in the polling of the devices. The request for access signals for the devices are retained for a period of time during which channel connection should be completed and then dropped. The CPU and the controller are freed to complete other work in between the polling cycles. The requests-for-access signals by the devices for connection to the channel that requested the connection does not tie up the channels and the devices while communication is being made.

REFERENCES:
patent: 4425615 (1984-01-01), Swenson et al.
patent: 4434466 (1984-02-01), Friedli et al.
patent: 4598363 (1986-07-01), Clark et al.
patent: 4774496 (1988-09-01), Tomasevich
patent: 4823312 (1989-04-01), Michael et al.
patent: 4881195 (1989-11-01), DeLong et al.
patent: 4958381 (1990-09-01), Toyoshima

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