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:
Oct. 26, 1999
Filed:
Dec. 19, 1996
Charles N Shaver, Cypress, TX (US);
Timothy R Zinsky, Houston, TX (US);
Paul J Broyles, Cypress, TX (US);
John E Larson, Houston, TX (US);
Compaq Computer Corporation, Houston, TX (US);
Abstract
A memory controller and method of operation for detecting different type of dynamic random access memory (DRAM) devices in a computer system. The memory controller has capabilities for improved page hits which cause the row address strobe signals to remain asserted following certain cycles. A mechanism in the memory controller selectably disables column address strobing. Different DRAM types are distinguishable by reading back data previously written to a memory location. Data is written to memory with a cycle causing the memory controller to keep the row address strobes asserted. Column address strobing is disabled. A read back cycle is performed without column address strobing. If data is present, the DRAM is an extended data output (EDO) DRAM. If data is not present, the DRAM is a fast page mode DRAM.