Advanced Micro Devices Corporation

Jaime Juarez

David M Lynch

J David Schell

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.

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Austin, TX, United States of America

Jaime Juarez