Forum Discussion
Altera_Forum
Honored Contributor
8 years agoVirtual JTAG is one of many source level debugging node types. It's a generic type intended as interface to user specific debugging functions, and the only fully documented SLD node type.
Each SLD node type has it's own set of ir_shift and dr_shift commands to operate it. As discussed in this previous thread http://www.alteraforum.com/forum/showthread.php?t=2199, the regular access to the Quartus JTAG stack is provided by dlls that can be basically called in user applications if you understand the interface.