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:
Aug. 31, 1999
Filed:
Oct. 20, 1997
William L Randolph, Durham, NC (US);
Rhonda Cassada, Hillsborough, NC (US);
Mitsubishi Semiconductor America, Inc., Durham, NC (US);
Abstract
A memory having a SRAM, a DRAM and two external IO ports is provided. The SRAM has three IO ports for enabling the external IO ports and the DRAM to access each and every memory cell in the DRAM. Each SRAM cell is provided with two IO ports coupled to the external IO ports, and with an IO port for transferring data to and from the DRAM. The triple-port SRAM cell comprises three input data lines coupled to a latching circuit for writing data supplied from the external IO ports and the DRAM, and three output data lines coupled to the latching system for reading stored data to the external IO ports and the DRAM. Three write address lines and three read address lines provide addressing of the SRAM cell for data writing and reading operations performed by the external IO ports and the DRAM. Each SRAM cell may be read concurrently via all three ports to make the most current data stored in the SRAM accessible from any port at any time.