E7a Mb Pcb V3 Link ★

reset_config srst_only srst_nogate init_target echo "E7A V3 Link engaged. Holding nSRRT for 50ms." adapter assert srst sleep 50 adapter deassert srst

Based on reverse-engineered schematics from similar industrial boards, the e7a mb pcb v3 link follows one of two standards:

Standard A – 10-pin ARM Cortex Debug (1.27mm pitch) e7a mb pcb v3 link

| Pin | Signal | Description | |------|--------|-------------| | 1 | VREF (3.3V) | Target voltage sense | | 2 | SWDIO / TMS | Data I/O | | 3 | GND | Ground | | 4 | SWCLK / TCK | Clock | | 5 | GND | Ground | | 6 | SWO / TDO | Trace output | | 7 | KEY / NC | No connect (keyed) | | 8 | nRESET | Reset line | | 9 | GND | Ground | | 10 | nTRST / NC | Optional reset |

Standard B – 6-pin JST SH (for compact devices) Critical Note: Always probe pin 1 for voltage

| Pin | Signal | |------|--------| | 1 | 3.3V | | 2 | SWDIO | | 3 | SWCLK | | 4 | nRESET | | 5 | GND | | 6 | UART TX (Debug) |

Critical Note: Always probe pin 1 for voltage before connecting any debugger. Some e7a v3 boards use 1.8V logic, not 3.3V. Connecting a 5V or 3.3V probe to a 1.8V link can destroy the e7a chip. e7a mb pcb v3 link

The e7a mb pcb v3 often ships with a locked bootloader. To flash custom firmware: