Patent · US Active

Tracing data from an asynchronous interface

US9606891B2 · kind B2 · utility

0Cited by

3References

19Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Norbert Hagspiel · Wissen, DE
Sascha Junghans · Herrenberg, DE
Matthias Klein · Poughkeepsie, US
Joerg Walter · Lörrach, DE

Key dates

Filing date	Jun 8, 2015
Grant date	Mar 28, 2017
Priority date	—
Expiry date	Jun 8, 2035

Classification

Technology area (CPC G)Physics
CPC primaryG06F2201/86
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

An apparatus for tracing data from a data bus in a first clock domain operating at a first clock frequency to a trace array in a second clock domain operating at a second clock frequency, wherein the first clock frequency is lower than the second clock frequency. The apparatus includes a change detector to detect a change of the data on the data bus in the first clock domain, a trigger responsive to the change detector to send a trigger pulse to the second clock domain, pulse synchronization on the second clock domain responsive to the trigger pulse to synchronize the trigger pulse to the second clock frequency of the second clock domain by a meta-stability latch, as well as a data capture in the second clock domain responsive to the pulse synchronization to capture data from the data bus and to store the captured data in the trace array.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.