The following table describes JTAG interface signals:
| Signal | I/O | Width | Description |
|---|---|---|---|
| TCK | O | 1 | Test clock output. Output clock for sampling the data. |
| TDI | O | 1 | Test data input (TDI) output. Serial data output. |
| TDO | I | 1 | Test data output (TDO) input. Serial data input. |
| TMS | O | 1 | Test mode select (TMS) output. Controls the transitions. |