ZERO SOM/ZERO Hardware/Power and Reset/JTAG
< ZERO SOM | ZERO Hardware
| HOME | SOMs | SBCs | ToloMEO Embedded Assistant |  GET A QUOTE
|
 ONLINE HELPDESK
|
| Roadmap | IoT Services | ML/AI services | Embedded Design Services |
| History | |||
|---|---|---|---|
| Issue Date | Notes | ||
| 2025/07/01 | First documentation release | ||
Contents
JTAG[edit | edit source]
JTAG signals are routed to the ZERO SOM contacts according to the OSM v1.2 standard. These signals output at 1.8 V logic, achieved with voltage translators on the SoM.
If needed, the reference voltage of 1.8 V is available at ball Y16 'VCC_3_TEST'.
The RZ SoC supports the boundary scan function: to enable it drive ball C18 'TEST_GENERIC' high.
JTAG signals[edit | edit source]
The following table reports the JTAG's signals available in the ZERO SOM contacts:
| OSM contact | OSM name | Notes |
|---|---|---|
| N17 | JTAG_TCK | Input CMOS 1.8 V |
| N19 | JTAG_TMS | Input CMOS 1.8 V |
| P17 | JTAG_TDI | Input CMOS 1.8 V |
| R17 | JTAG_TDO | Output CMOS 1.8 V |
| R19 | JTAG_nTRST | Input CMOS 1.8 V |
| Y16 | VCC_3_TEST | 1.8 V reference voltage |
