Patent ID: 7573741
Filing Date: 2009-08-11
Classification: G11C

Abstract:
1. A method for adjusting signal propagation times in a system in which connections of a controller are connected to connections of at least one memory chip via a plurality of connecting lines for the purpose of transmitting control and data signals and at least one time reference signal, comprising: i) changing an input impedance at a respective connection of at least two connecting lines into a reflective termination for the connecting lines in question; ii) ascertaining propagation time differences between the connecting lines from a result of echo measurements in which a respective transmitted pulse is applied to the connection of the connecting lines which has not had its input impedance changed into the reflective termination and an echo time which elapses between an edge of the transmitted pulse and an appearance of the echo of this edge reflected from the other end is measured; and iii) setting delay devices associated with the connecting lines on the basis of the ascertained propagation time differences in order to compensate for the propagation time differences.