Patent ID: 7412640
Filing Date: 2008-08-12
Classification: H04L

Abstract:
1. A method of checking the accuracy of a pseudorandom bit sequence (PRBS), wherein a first PRBS is generated at a PRBS generator, including a first shift register chain, and presented to a device under test, and the device under test generates a second PRBS in response to the first PRBS, the method comprising the steps of: delaying the second PRBS in a second shift register chain that corresponds to the first shift register chain to generate a delayed second PRBS; detecting the presence of an error bit in the second PRBS by comparing the delayed second PRBS at an intermediate point in the second shift register chain with the second PRBS; and prohibiting propagation of the detected error bit such that the detected error bit does not further propagate through the second shift register chain.