Altera Virtual JTAG IP Core - Manual (Page 28)

Compiling the Design
You can instantiate a maximum of 128 instances of the Virtual JTAG megafunction in a design. After
compilation, each instance has a unique ID, as shown on the Virtual JTAG Settings page of the Analysis &
Synthesis section of the Compilation Report, as shown in the figure below.
Figure 14: IDs of Virtual JTAG Instances
ID of sid_virtual_jtag
instances
These unique IDs are necessary for Quartus II Tcl API to properly address each instance of the megafunction.
The addition of Virtual JTAG megafunctions uses logic resources in your design. The Fitter Resource Section
in the Compilation Report shows the logic resource utilization, as shown in the figure below.
Virtual JTAG Megafunction (sld_virtual_jtag) Altera Corporation
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Compiling the Design 28
2014.03.19