How to Connect to an External Programmer

Ivo Clarysse
  • Updated
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The PLT-200A contains an FTDI Multi-Protocol Synchronous Serial Engine (MPSSE) handling programming of microcontrollers and SoCs.

In some cases, it may be desirable to instead use an external programmer.

The PLT supports 2 ways of doing this:

  • External programmer, driven by PLT
  • External programmer, externally controlled.

Externally controlled Programmer

  • Connect external programmer USB to controlling PC
  • Connect programmer signal lines to corresponding ports

Do not control programming from the YAML test plan, causing the PLT's built-in programmer to retain a high-impedance connection to the JTAG and SWD signals. Instead, the signals from the PLT-200A rear connectors are fed into the respective JTAG and SWD signals on a connected ICT fixture or breakout board.

Note: in this setup, avoid powering JTAG_VCC and SWD_VDD from the YAML file.

DUT SWD Probe connector

idc6-drawing.png

        Face view of SWD receptacle (J8) on PLT rear

  • TC2030-IDC, 6-pin Tag-Connect (SWD)
  • PLT200A: J8 (CnC Tech 3020-06-0200-00)
Pin SWD Signal Description
1 SWD_VDD DUT Power
2 SWD_SWDIO Serial Wire Data I/O
3 SWD_NRST System Reset
4 SWD_SWCLK Serial Wire Clock
5 GND Ground
6 SWD_SWO Serial Wire Output

 

DUT JTAG Probe connector

idc10-drawing.png

        Face view of JTAG receptacle (J11) on PLT rear

  • TC2050-IDC, 10-pin Tag-Connect
  • PLT-200A: J11 (CnC Tech 3020-10-0200-00)
Pin JTAG Signal Description
1 +3V3 Debug Rail Voltage
2 JTAG_TMS Test Mode Select
3 GND Ground
4 JTAG_TCK Test Clock Pin
5 JTAG_VCC DUT Power
6 JTAG_TDO Test Data Out
7 n.c.  
8 JTAG_TDI Test Data In
9 n.c.  
10 JTAG_TRST System Reset

Note: do not connect +3V3 (Pin 1) to the external programmer, as it is driven by the PLT.

PLT-controlled external Programmer

  • Connect an ST-Link or JLink programmer to an available USB port in the rear of the PLT
  • Connect the programmer directly to the DUT.

Control programming from the YAML test plan, using the following program targets:

ST-Link:

  • STM32F4_STLink
  • STM32L4_STLink
  • STM32L4_IoT_STLink

JLink:

  • nRF52_JLink
  • nRF91_JLink

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