Controlling scan access to a scan chain

Patent metadata

Field	Value
Publication number	US-8972808-B2
Application number	US-201313850371-A
Country	US
Kind code	B2
Filing date	Mar 26, 2013
Priority date	Dec 7, 2011
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

A technique for controlling scan access of multiple scan devices (including or more slave scan devices and a master scan device) to a scan chain includes sending, by a requesting slave scan device included in the one or more slave scan devices, a first request for access to the scan chain to the master scan device. The master scan device and the one or more slave scan devices are connected to the scan chain. The technique also includes receiving, at the requesting slave scan device, an evaluation result from the master scan device and accessing, by the requesting slave scan device, the scan chain in response to the evaluation result indicating access granted. Finally, the technique includes sending, by the requesting slave scan device, one or more second requests for access to the scan chain to the master scan device in response to the evaluation result indicating access denied.

First claim

What is claimed is:

1. A method for controlling scan access of multiple scan devices to a scan chain, the multiple scan devices including one or more slave scan devices and a master scan device, the method comprising:
a requesting slave scan device included in the one or more slave scan devices sending a first request for access to the scan chain to the master scan device, wherein the master scan device and the one or more slave scan devices are connected to the scan chain;
rece…

Assignees

• IBM

Inventors

• Geukes Benedikt
• Michel Heiko
• Michel Matteo
• Walz Manfred

Classifications

• G01R31/318555 Primary

  Physics · mapped topic

• G01R31/3177 Primary

  Physics · mapped topic