AN 802: Intel® Stratix® 10 SoC Device Design Guidelines

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ID 683117
Date 12/14/2020
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5.13. Embedded Software Debugging and Trace

The HPS Debug Access Port (DAP) can be accessed through dedicated HPS pins configured as JTAG, or it can be accessed through FPGA JTAG interface pins.

The option to access the HPS JTAG interface through the FPGA JTAG pins is available in the Intel® Quartus® Prime Pro Edition project.

At power up, the FPGA appears as the first device in the JTAG chain. Once the FPGA is configured with an image for which the HPS JTAG interface is made available to the FPGA JTAG pins, the HPS appears as the first interface in the JTAG chain; and the FPGA appears as the second interface. This requires different connection settings for the FPGA tools, like the Intel® Quartus® Prime Pro Edition Programmer when it is used at power up and after FPGA configuration.

GUIDELINE: You must have an available JTAG connection to the board that can be used for development as well as to debug and diagnose field issues.

The HPS offers two trace interfaces either through HPS Dedicated I/O or FPGA I/O. The interface through HPS Dedicated I/O is a slow trace interface that you can use to trace low bandwidth traffic (such as the MPU operating at a low frequency).

To improve the trace bandwidth, you can use the standard trace interface which is a 32-bit single data rate interface to the FPGA.

Consult your trace vendor's datasheet to determine if the trace bus requires termination. Failure to include termination when the trace vendor requires it can lead to trace data corruption or limit the maximum operating frequency of the interface.

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