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:
May. 14, 2002
Filed:
Dec. 11, 1998
Other;
Abstract
A concurrent write duplexing device with extension of memory bus according to the present invention includes: a primary memory having a first memory in which changed information is stored and a first memory controller for controlling the first memory; a secondary memory having a second memory in which the operating system is loaded to change an operation mode from the standby module to the active module upon failure of duplexing separation and a second memory controller for controlling the second memory; a bus transceiver part for exchanging data with a CPU through a system bus and having a bus transceiver in the first memory controller and a bus transceiver in the second memory controller, to thereby determine as to whether the first and second memory controller operate; and a memory switch part for exchanging data between the active module and the standby module and having memory switches which set direction of memory bus in accordance with an operation mode of module, so that write operation performed in the memory controller of the active module will be executed in the standby module with the same contents and a memory switch controller for controlling the memory switches.