Datasheet

FRDM-KV31F Hardware Description
Freedom FRDM-KV31F Development Platform User’s Guide, User's Guide, 0, 02/2016
Freescale Semiconductor, Inc. 5
Figure 3. OpenSDA high-level block diagram
3.2.1.
Debug interface
Signals with SPI and GPIO capability are used to connect directly to the SWD of the KV31. These
signals are also brought out to a standard 10-pin (0.05”) Cortex debug connector (J9). It is possible to
isolate the KV31 MCU from the OpenSDA circuit and use J9 to connect to an off-board MCU. To
accomplish this, cut the trace on the bottom side of the PCB that connects J11 pin 2 to the J9 pin 4. This
disconnects the SWD_CLK pin to the KV31 so that it does not interfere with the communications to an
off-board MCU connected to J11.
Figure 4. SWD debug connector
J9 is populated by default. A mating cable, such as a Samtec FFSD IDC cable, can then be used to
connect from the OpenSDA of the FRDM-KV31F to an off-board SWD connector.