AXEL Lite SOM/AXEL Lite Hardware/Power and Reset/JTAG
History | |||
---|---|---|---|
Version | Issue Date | Notes | |
1.0.0 | Sep 2020 | New layout documentation |
On board JTAG connector[edit | edit source]
JTAG signals are routed to a dedicated connector on the AXEL Lite PCB.
The connector is placed on the top side of the PCB, at the upper-right corner (please see the picture below).
J7 - SOM Connector's pinout[edit | edit source]
J7 footprint mates with Samtec FSI-110-03-G-S connector. The following table reports the connector's pinout:
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 | 10K pull-up to 3V3 (BOARD_PGOOD driven signal) |
4 | JTAG_TDO | - | 13 | 10K pull-up to 3V3 (BOARD_PGOOD driven signal) |
5 | JTAG_TDI | - | 5 | 10K pull-up to 3V3 (BOARD_PGOOD driven signal) |
6 | JTAG_nTRST | - | 3 (*) | 10K pull-up to 3V3 (BOARD_PGOOD driven signal) |
7 | CPU_PORn | - | 15 (*) | - |
8 | N.C. | - | - | |
9 | N.C. | - | - | |
10 | JTAG_VREF | - | 1 | 3V3 (BOARD_PGOOD driven signal) |
(*) keep the possibility to be unconnected