Virtual JTAG Interface (VJI) megafunction. This megafunction provides access to the PLD source through the JTAG interface. The Quartus® Prime Standard Edition software or JTAG control host identifies each instance of this megafunction by a unique index. Each megafunction instance functions in a flow that resembles the JTAG operation of a device. The logic that uses this interface must maintain the continuity of the JTAG chain on behalf the PLD device when this instance becomes active. The sld_virtual_jtag megafunction is available for all Altera device families supported by the Quartus® Prime Standard Edition software.
Altera recommends instantiating this function with the IP Catalog .
When you create your megafunction, you can use the IP Catalog to generate a netlist for third-party synthesis tools.