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:
Jan. 29, 2001
J. David Schell, Round Rock, TX (US);
David M. Lynch, Austin, TX (US);
Jaime Juarez, Austin, TX (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
Various circuits for shifting the crossing point level of a pair of differential clocks signals are disclosed. In some embodiments, a differential clock driver provides a pair of differential clock signals to a device having a specified valid range for the crossing point of the differential clock signals. A level-shifting device is coupled to one or both of the differential clock signals to shift the crossing point to lie within the valid range. The device may be a memory device in some embodiments, and in certain embodiments the memory device may be DDR SDRAM. A method for configuring a computer system is also disclosed. An actual differential clock crossing point is compared to a specified range for the crossing point. If the actual crossing point is not within the specified range, a level-shifting device is coupled to one or both of the differential clock signals.