The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 05, 1991
Filed:
Apr. 07, 1988
Wing M Chan, Fremont, CA (US);
Tandem Computers Incorporated, Cupertino, CA (US);
Abstract
In a data processing system, a device controller, configured to control data transfers between a processor unit and a peripheral device on an input/output bus, is provided with apparatus that permits a data transfer cycle to continue until all data has been transferred, or to allow for interruption of the data transfer cycle by another device controller requesting access to the input/output via a request signal. During a data transfer cycle the apparatus resonds to detection of the request signal to interrupt the data transfer cycle after a predetermined number of data words are transferred, permitting access to the input/output bus for other of the device controllers. In absence of the request signal, the apparatus permits the data transfer to continue until all data has been transferred between the peripheral device and the processor unit.