公开(公告)号：US09665289B1

公开(公告)日：2017-05-30

申请号：US14959141

申请日：2015-12-04

Applicant: Inphi Corporation

Inventor： Dat Tuan Mach ,  Alejandro Lopez-Sosa ,  Chao Xu ,  Chien-Hsin Lee

IPC: G09F3/06 ,  G06F3/06 ,  G06F13/16 ,  G06F13/40 ,  G06F11/27

CPC classification number: G06F3/061 ,  G06F3/0604 ,  G06F3/0632 ,  G06F3/067 ,  G06F11/27 ,  G06F13/1668 ,  G06F13/4068

Abstract: Techniques are described for processing signal information from a high speed communication bus. The techniques include determining spatial regions on an eye by sampling a plurality of time and voltage points to determine a two-dimensional matrix. Then, the points are assigned a numerical value from combined time and voltage functions based upon a distance from eye edges (e.g., minimum setup time requirement and minimum hold time requirement along the time dimension). Sampling to generate the matrix may comprise selecting an initial point, splitting a first margin along a first dimension into equally spaced regions, and then sampling a second margin along a second dimension into equally spaced regions. Determining the points is based on shifting a strobe signal (DQS) position and a data signal (DQ) position and running a plurality of memory built-in self test (BIST) engines and a plurality of results of BIST tests.