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:
Dec. 15, 2015
Filed:
Jun. 14, 2013
Arm Limited, Cambridge, GB;
Sean James Salisbury, Sheffield, GB;
Andrew David Tune, Sheffield, GB;
Alistair Crone Bruce, Sheffield, GB;
ARM Limited, Cambridge, GB;
Abstract
A data processing apparatus is provided with a master device and a slave device which communicate via communication circuitry. The slave device is associated with a predetermined number of permission tokens that is equal to a maximum number of currently pending messages that can be accepted for processing from the communication circuitry by that slave device. The slave device transmits these permission tokens to the master device. The master device takes exclusive temporary possession of the permission tokens that it receives such that the permission tokens are then no longer available to any other master device. A master device initiates a message to a slave device when the master device has exclusive temporary possession of a permission token for that slave device. When the master device has initiated its message, then it relinquishes the exclusive temporary possession of the permission token such that it is then available for other devices.