See @par
http://en.wikipedia.org/wiki/Joint_Test_Action_Group
-and @par
- http://www.inaccessnetworks.com/projects/ianjtag/jtag-intro/jtag-state-machine-large.png
+@image html jtag-state-machine-large.png
The first page (among other things) shows a logical representation
describing how multiple devices are wired up using JTAG. JTAG does not