Using the JTAG User TAP Block

Add the JTAG User TAP block to your interface if you want to use the FPGA JTAG pins to communicate with the design running in the core.

You specify the instruction to use with the JTAG Resource setting. Topaz FPGAs have four JTAG User TAP blocks. To use more than one, add JTAG User TAP blocks to your interface design, one for each resource.

Table 1. JTAG User TAP Signals
Signal	Direction	Description
<instance>_TDI	Input	JTAG test data in pin.
<instance>_TCK	Input	JTAG test clock pin.
<instance>_TMS	Input	JTAG mode select pin.
<instance>_SEL	Input	User instructive active pin.
<instance>_DRCK	Input	Gated test clock.
<instance>_RESET	Input	Reset.
<instance>_RUNTEST	Input	Run test pin.
<instance>_CAPTURE	Input	Capture pin.
<instance>_SHIFT	Input	Shift pin.
<instance>_UPDATE	Input	Update pin.
<instance>_TDO	Output	JTAG test data out pin.