Intel Corporation

Subrata Mandal

Mirza Jahan

Adhiveeraraghavan Srikanth

Gregory C Parrish

A valid data strobe detection technique detects a valid data strobe contained within a strobe signal by first determining whether a measured voltage level of the strobe signal is above or below a preselected threshold level. A time period in which the measured voltage level is continuously one of either above or below the preselected threshold level is then measured and a valid data strobe is detected upon the measured time period being greater than a preselected period of time. A comparator may be used to determine whether the measured voltage level of the strobe signal is above or below the preselected threshold level and a sample and hold unit may be used to measure the time period in which the strobe signal is one of either above or below the preselected threshold level.

Valid data strobe detection technique

Various methods, systems and apparatuses having an integrated circuit that contains a calibration circuit having a series of delay elements to receive a reference signal. The reference signal establishes a standard unit of time. The calibration circuit also generates one or more calibrated delay signals derived from the reference signal. The one or more calibrated delay signals are precise to a known fraction of the standard unit of time.

Method and apparatus for calibration of a delay element

In one embodiment of the invention, a clamping circuit clamps an input signal to reduce overshoot and ringback. A pulse generator generates a pulse signal having a pulse interval from the input signal and a delayed signal. The input signal transitions from a first level to a second level. The delayed signal is derived from the input signal. A controller generates a control signal responsive to the pulse signal. A switching circuit clamps one of the overshoot and the ringback of the input signal within the pulse interval upon receipt of the control signal.

System and method for reducing over-shoot and ringback by delaying input and establishing a synchronized pulse over which clamping is applied

According to one aspect of the invention, a method is provided in which an input signal is received at a first node of a buffer circuit. The propagation of the input signal from the first node to a second node in the buffer circuit is delayed by a delay period based upon a first control input. The delay period is adjusted by a factor based upon a second control input.

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Orangevale, CA, United States of America

Subrata Mandal