You might run into issues when trying to connect to a hardware target. Here are some common issues and recommendations on how to resolve them:
- If you are not able to correctly identify the hardware devices on your target, it might mean that your hardware is not capable of running at the default target frequency. You can adjust the frequency of the TCK pin of the hardware target or cable (see the previous figure). Note that each type of hardware target may have different properties. Refer to the documentation of each hardware target for more information about these properties.
- While the Vivado hardware server will attempt to automatically determine the instruction register (IR) length of all devices in the JTAG chain, in some rare circumstances it might not be able to correctly do so. You should check the IR length for each unknown device to make sure it is correct. If you need to specify the IR length, you can do so directly in the Hardware Devices table of the Open New Hardware Target wizard (see Opening a New Hardware Target).