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:
Dec. 14, 1999
Filed:
Dec. 16, 1997
Wei-Lun Chen, Taipei, TW;
Acer Laboratories Inc., Taipei, TW;
Abstract
This invention discloses a novel design to solve the clock skew problems in a data processing system by using PLL circuitry inside a memory controller in combination with an adjustable delay element to provide a write clock signal, a read clock signal, and a memory clock signal for triggering the write data buffer and the read buffer of the memory controller, and the memory module respectively. The memory clock signal has a phase lead relative to the read clock signal and a phase lag relative to the write clock signal. The phase lead and the phase lag compensate for phase differences between clock signals arriving at the read data buffer and the write data buffer of the memory controller, and the memory module respectively due to phase delays resulting from the different paths for transmitting clock signals, thereby synchronizing the clock signals.