Data strobe signals (DQS) for high speed dynamic random access memories (DRAMs)

Embodiments are provided in which a method for delaying a strobe signal for a first pre-specified amount of time is described. A test signal is sent through a first number of delay books and a test is done as to whether it takes the test signal approximately a second pre-specified amount of time to pass the first number of delay books. Then, the number of delay books is increased or decreased by one at a time and until the number of delay books reaches a second number where it takes the test signal approximately the second pre-specified amount of time to pass the second number of delay books. From the second number, a third number of delay books is determined which is needed to cause a propagation delay approximately equal to the first pre-specified amount of time. Finally, the strobe signal is passed through the third number of delay books.