Data eye monitor method and apparatus,申请号US20070768810-传众专利搜索

Data eye monitor method and apparatus

申请公布号：US8108738(B2)

申请号：US20070768810

申请日期：2007.06.26

申请公布日期：2012.01.31

申请人：

GARA ALAN G.;MARCELLA JAMES A.;OHMACHT MARTIN;INTERNATIONAL BUSINESS MACHINES CORPORATION

发明人：GARA ALAN G.;MARCELLA JAMES A.;OHMACHT MARTIN

分类号：G06K5/04;G11B5/00;G11B20/20

主分类号：G06K5/04

摘要：An apparatus and method for providing a data eye monitor. The data eye monitor apparatus utilizes an inverter/latch string circuit and a set of latches to save the data eye for providing an infinite persistent data eye. In operation, incoming read data signals are adjusted in the first stage individually and latched to provide the read data to the requesting unit. The data is also simultaneously fed into a balanced XOR tree to combine the transitions of all incoming read data signals into a single signal. This signal is passed along a delay chain and tapped at constant intervals. The tap points are fed into latches, capturing the transitions at a delay element interval resolution. Using XORs, differences between adjacent taps and therefore transitions are detected. The eye is defined by segments that show no transitions over a series of samples. The eye size and position can be used to readjust the delay of incoming signals and/or to control environment parameters like voltage, clock speed and temperature.