Patent ID: 7275173
Filing Date: 2007-09-25
Classification: G11C

Abstract:
1. Method for measuring and compensating skews of data transmission lines connecting at least one data transmission device with a data reception device via a parallel data bus comprising for each data transmission line the following steps: a) measuring a relative time delay of a data transmission line by transmitting a determined sequence of measurement vectors each consisting of an alternating bit pattern via said data transmission line, wherein a bit alternation frequency is halfed with every transmitted measurement vector; b) comparing received measurement vectors transmitted via said data transmission line with corresponding reference vectors stored in a data reception device; c) shifting the received measurement vectors by inserting data unit intervals until one of the received measurement vectors matches one of the corresponding reference vectors; d) calculating a relative skew of the data transmission line depending on the number of inserted data unit intervals with respect to a slowest data transmission line; and e) compensating the calculated relative skew of the data transmission line by means of delay elements switched in response to the calculated relative skew.