altera_soft_core_jtag_io Megafunction

Soft core JTAG I/O megafunction. This megafunction provides a standard JTAG interface that controls all JTAG accessible extensions. It controls the SLD JTAG hub to which SLD debug nodes connect. Optionally, it provides a signal to select whether the JTAG accessible extension is controlled by the JTAG I/O on this megafunction or by the JTAG I/O on the device.

A minimal JTAG controller in the megafunction allows tools to communicate to all JTAG accessible extension instances connected to sld_hub. The JTAG IR instructions implemented are BYPASS,IDCODE, USR0, and USR1. All other IR values are mapped to BYPASS. This JTAG controller returns the IDCODE value of 0x020030DD, which is assigned to be the soft JTAG controller. The tdo output is not tri-stated.

The altera_soft_core_jtag_io megafunction is available for all Intel device families supported by the Quartus^® Prime software. You can only use one instance of this megafunction in a project.