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:
Sep. 28, 1999
Filed:
Jun. 17, 1998
Tooru Ueda, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A multi-port type semiconductor memory device which can reduce the number of bit lines, the size of a memory, and the power consumption, wherein write and read operations are carried out by using a pair of bit lines in common; at the time of a write operation the levels of the bit lines are determined in response to write data, and the levels of first and second memory nodes are determined via a writing port WPT and maintained by latch circuits; at the time of a read operation, in response to the levels of the first and the second memory nodes, the levels of the bit lines are determined via a first and a second reading ports and read data is output in accordance with the levels of the bit lines by a sense amplifier.