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Contents
JTAG interfaceEdit
JTAG interface allow the developer to access every peripheral of the SoC using a debugger.
It is also possible to add the ETH1 PHY to the JTAG daisy chain (with a custom BOM).
The TRACE interface can be made available in alternative to the NAND or eMMC memory flash on board of the SoM.
DescriptionEdit
The JTAG interface available on the Evaluation Kit at the connector JD1.
JD1 is a 10x1x2.54mm strip header connector and it is not mounted.
SignalsEdit
The following table describes the interface signals:
| Pin# | Pin name | Function | ARM-20 JTAG | Notes |
|---|---|---|---|---|
| 1 | DGND | - | 4,6,8,10,12,14,16,18,20 | For example documented on Lauterbach specification |
| 2 | JTAG_TCK | - | 9 | - |
| 3 | JTAG_TMS | - | 7 | - |
| 4 | JTAG_TDO | - | 13 | - |
| 5 | JTAG_TDI | - | 5 | - |
| 6 | JTAG_MOD | - | - | 10K pull-down inside the SoM |
| 7 | CPU_PORn | - | 15 (*) | - |
| 8 | N.C. | - | - | - |
| 9 | N.C. | - | - | - |
| 10 | JTAG_VREF | - | 1 | 3V3 (BOARD_PGOOD driven signal) |
(*) optional signals, keep the possibility to be unconnected.