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. 31, 2011
Filed:
Apr. 27, 2005
Robert Michael Walker, Raleigh, NC (US);
Perry Willmann Remaklus, Jr., Raleigh, NC (US);
Robert Michael Walker, Raleigh, NC (US);
Perry Willmann Remaklus, Jr., Raleigh, NC (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
In a directed auto-refresh (DARF) mode, refresh commands are issued by a controller, and refresh row and bank addresses are maintained internally to a memory module. A bank address counter internal to the memory is initialized to a first predetermined value upon entering DARF mode. The memory refreshes the currently addressed bank in response to a DARF command, and increments the bank address counter in a predetermined sequence. The controller tracks the bank address, and may issue one or more memory access commands while a DARF operation is being performed, if the memory access and the refresh are directed to different banks. Upon exiting a self-refresh mode, the bank address counter assumes a second predetermined value. The second predetermined value may be fixed, or may be n+1, where n is the value of the bank address counter when self-refresh mode is initiated.