Patent ID: 7284169
Filing Date: 2007-10-16
Classification: G11C

Abstract:
1. A write strobe preamble/postamble test system, comprising: a write strobe generator operable to generate a digital signal having a selectable number of transitions between first and second logic levels; a phase interpolator receiving an input clock signal and generating an enable clock signal having a phase relative to the phase of the input clock signal that is controlled by a phase control signal; an enable circuit coupled to receive the enable clock signal from the phase interpolator, the enable circuit being operable to generate an active enable signal in synchronization with a transition of the enable clock signal responsive to receiving a DQS enable signal; a transmitter coupled to receive the digital signal from the write strobe generator and the enable signal from the enable circuit, the transmitter being operable to transmit as a write strobe signal the digital signal responsive to the enable signal being active; and a control circuit coupled to the enable circuit and the phase interpolator, the control circuit being operable to apply the DQS enable signal to the enable circuit and to apply the phase control signal to the phase interpolator to control the timing and duration of the enable signal generated by enable circuit.