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:
Oct. 11, 2016
Filed:
Dec. 30, 2013
Sandisk Technologies Inc., Plano, TX (US);
Yong Peng, Milpitas, CA (US);
Rajeev Nagabhirava, Santa Clara, CA (US);
SanDisk Technologies LLC, Plano, TX (US);
Abstract
A nonvolatile memory is organized into blocks as erase units and physical pages as read/write units. A host addresses data by logical pages, which are storable in corresponding physical pages. Groups of logical pages may be further aggregated into logical groups as addressing units. The memory writes host data in either first or second write streams, writing to respective blocks either logical-group by logical-group or logical-page by logical-page in order to reduce the size of logical-to-physical-address maps that are cached in a controller random-access memory (RAM). A group-level map may be used to track logical groups. A page-level map may be used to track logical pages. Only one block at a time needs be open in the second stream to accept logical pages from multiple logical groups that are active. Garbage collection is performed on the blocks from each write stream independently without data copying between the two streams.