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. 01, 1987
Filed:
Mar. 31, 1986
Michael R Hereth, Westford, MA (US);
Patricia A Martin, Westford, MA (US);
Wang Laboratories, Inc., Lowell, MA (US);
Abstract
A memory subsystem comprises pseudo-static memory chips operable in a low power self refresh mode or in a standby mode in which less access time is required. All memory chips are initially placed in the self refresh mode and are changed to the standby mode only when individually accessed. Then, the accessed chip is retained in the standby mode until such time as all chips are periodically returned to the self refresh mode. When a memory chip is first changed to the standby mode a delay time is provided to allow for the greater required access time. Thereafter, the memory chips which have then been placed in the standby mode are tracked by latching of addresses and comparison of the latched addresses to subsequently received addresses.