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:
Apr. 07, 1998
Filed:
Dec. 20, 1993
Robert Wayne Sparks, Kyle, TX (US);
Wallace Baker Harwood, III, Austin, TX (US);
Thomas Jew, Austin, TX (US);
James Bradley Eifert, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A data processing system having a memory with a low power operating mode and a method of operation is described. An static random access memory (SRAM) (18) having a low power operating mode is provided for a data processing system (10). A programmable control bit is used for switching the SRAM (18) from a one clock cycle operating mode to a two clock cycle, or low power, operating mode. Initially, during the two cycle operating mode, only a bus interface unit (41) is active. During the first cycle, an address is compared to determine if the address is a valid address. If the address is valid, address decoders (42) are enabled, and a data transfer is completed on the second clock cycle. If the address is not valid, the address decoders (42) remain disabled and memory array (43) remains in a quiescent state consuming minimum power. During one cycle mode, the SRAM (18) decodes every address in order to respond in one clock cycle to a valid address.