3.9.1. Internal and External JTAG Interfaces
There are two interfaces to access the JTAG control block in Intel® MAX® 10 devices:
- External JTAG interface—connection of the JTAG control block from the physical JTAG pins; TCK, TDI, TDO, and TMS.
- Internal JTAG interface—connection of the JTAG control block from the internal FPGA core fabric.
You can only access the JTAG control block using either external or internal JTAG interface one at a time. External JTAG interfaces are commonly used for JTAG configuration using programming cable. To access the internal JTAG interface, you must include the JTAG WYSIWYG atom in your Intel® Quartus® Prime software design.
To ensure the internal JTAG interfaces of Intel® MAX® 10 devices function correctly, all four JTAG signals (TCK, TDI, TMS and TDO) in the JTAG WYSIWYG atom need to be routed out. The Intel® Quartus® Prime software will automatically assign the ports to their corresponding dedicated JTAG pins.