In RT PolarFire FPGA, the JTAG pins are located in a dedicated I/O Bank 3. For information about the I/O states during JTAG programming, see I/O States During Programming.
The JTAG bank voltages can be set to operate at 1.8 V, 2.5 V, or 3.3 V. The following table lists the JTAG pins.
| Pin Name | Direction | Weak Pull-Up/Unused Condition | Description |
|---|---|---|---|
| TMS | Input | Yes/DNC | JTAG test mode select. |
| TRSTB | Input | Yes1 | JTAG test reset. Must be held low during device operation. |
| TDI | Input | Yes/DNC | JTAG test data in. In ATPG or test mode, when using a 4-bit TDI bus, this I/O is used as tdi[0]. |
| TCK | Input | No2 | JTAG test clock |
| TDO | Output | No/DNC | JTAG test data out. |
| 1. If TRSTB is unused and the System Controller is in suspend mode, either an external 1 kΩ pull-down resistor must be connected to it to override the weak internal pull-up or it must be driven LOW from an external source. 2. In unused condition, must be connected to VSS through 10 kΩ resistor. |