Circuits, systems and methods for dynamic reference voltage...

Details Circuits, systems and methods for dynamic reference voltage... Circuits, systems and methods for dynamic reference voltage...

2007-06-26

2007-06-26

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S064000, C702S080000, C702S107000, C365S189090

Reexamination Certificate

active

11021598

ABSTRACT:
A circuit, system and method adjusts a reference voltage, such as an internal or external reference voltage VREF, in response to a first voltage at a first contact, such as a pin on a memory controller used for reading or writing data, and a second voltage at a second contact in embodiments. Logic is coupled to the first and second contacts to provide a control signal in response to the first and second voltages. A comparator provides an input signal to the logic in response to a target reference voltage and the reference voltage during a calibration or initialization mode of operation. In an alternate embodiment, a plurality of data values at a first contact are compared to a predetermined plurality of test data. An up/down signal is then provided to a counter and a register stores a counter value used to provide a reference voltage.

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