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. 27, 1999
Filed:
Mar. 07, 1997
Applicant:
Inventors:
Robert P Gittinger, Austin, TX (US);
James O Mergard, Pflugerville, TX (US);
Assignee:
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
711167 ; 365193 ; 365203 ;
Abstract
A DRAM control circuit accommodates different speed grade DRAMs by modifying the RAS strobe. A number of wait states are inserted into a DRAM access cycle, having a start time and an end time, between the start and the end time of the access cycle. When the number of wait states inserted is zero, the RAS is deasserted at a first time relative to the end of the access cycle. When the number of wait states is at least one, the RAS is deasserted at a second time, earlier than the first time, relative to the end time of the access cycle, thereby increasing the row address strobe precharge time.