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:
May. 06, 2014
Filed:
Nov. 21, 2011
Jason M. Kassoff, Denver, CO (US);
Jason M. Kassoff, Denver, CO (US);
Apple Inc., Cupertino, CA (US);
Abstract
In an embodiment, a memory port controller (MPC) is coupled to a memory port and receives transactions from processors and a coherency port (ACP) used by one or more peripheral devices that may be cache coherent. The transactions include various quality of service (QoS) parameters. If a high priority QoS transaction is received on the ACP, the MPC may push previous (lower priority) transactions until the high priority transaction may be completed. The MPC may maintain a count of outstanding high priority QoS transactions. The L2 interface controller and ACP controller may push increment and decrement events based on processing the high priority QoS transactions, and the MPC may push the memory transactions when the count is non-zero. In an embodiment, the MPC may continue pushing transactions until the L2 interface controller informs the MPC that the earlier transactions have been completed.