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:
Jan. 18, 2005
Filed:
Nov. 20, 2002
Tadato Yamagata, Tokyo, JP;
Tadato Yamagata, Tokyo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
In a memory system having a data bus transferring data in either direction, highly reliable data transfer is provided regardless of the direction in which data is transferred. The signal lines of a data bus () bidirectionally transfer data. That is to say, during data write operations to a DIMM, the signal lines transfer data from a memory controller () to the DIMM, and during data read operations, they transfer data from the DIMM to the memory controller (). The signal lines have, as terminating resistors, terminating variable resistors (VRt) whose impedance is controlled by the memory controller (). During data write operations to the DIMM, the memory controller () sets the impedance of each terminating variable resistor (VRt) at a value suitable for writing, and during data read operations, it sets the impedance of each terminating variable resistor (VRt) at a value suitable for reading.