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. 28, 2013
Filed:
May. 13, 2011
James Edward Myers, Bottisham, GB;
John Philip Biggs, Teversham, GB;
David Walter Flynn, Cambridge, GB;
Carsten Tradowsky, Karlsruhe, GB;
James Edward Myers, Bottisham, GB;
John Philip Biggs, Teversham, GB;
David Walter Flynn, Cambridge, GB;
Carsten Tradowsky, Karlsruhe, GB;
ARM Limited, Cambridge, GB;
Abstract
Apparatus for storing a data value in the form of a master-slave latch supporting zig-zag power gating is described. A NAND gateat the output of the latch forces a predetermined retention signal value at the output from the latch during a retention mode. A scan multiplexerat the input to the latch selects the scan input, which is the predetermined retention signal from another latch, during the retention mode. Within the latch power gated circuitryis subject to zig-zag power gating using virtual power rails VDDZ and VSSZ so as to reduce the leakage current. State storing circuitryis permanently connected to the power supplies VDDG, VSSG such that it is able to maintain whatever signal value is stored therein during the retention mode.