Patent ID: 8989329
Filing Date: 2015-03-24
Classification: H03L,H04L

Abstract:
1. An apparatus comprising eye measurement circuitry, the eye measurement circuitry comprising a controller module, a margining input module, a compare module, and a counter logic module; wherein: the margining input module is to apply a margining input to the loop filter to shift a frequency of the margining clock signal by a constant amount related to the margining input; the compare module is to compare a first bit stream and a second bit stream to detect an error, wherein the first bit stream is related to a transmitted bit stream received by the receiver under test; and the counter logic module is to determine a count of clock cycles by counting cycles of the receiver clock signal or the margining clock signal; the eye measurement circuitry is to determine an eye width associated with the receiver under test; and the eye width associated with the receiver under test is related to the margining input, the receiver clock signal frequency and the count of clock cycles-when the error is detected.