connectorinterconnectjtagpcbsocket
ARM-based device have 8-pin 2x4pin JTAG header. J-Link debug probe have standard 20-pin J-Link connector. I have 8-pin 2×4 Socket-Socket IDC Ribbon Cable.
One end connects to the 8-pin JTAG header on device, and the other end should be connected to J-Link probe. What is better way to interface this 2×4 pin socket with 20-pin J-Link probe? Should be used a custom-built connector for this, which connects matching pins? Please advice the most handy way.
This is the official ARM Cortex JTAG/SWD connector diagram:
You should follow the data sheet/user manual about any resistors that are required. SWD pins on other LPC chips are usually pulled up internally.
The LPCXpresso IDE might be defaulting to the SWD interface. You need to select the JTAG interface, which is probably what the LPC4337 uses initially.
I'd do it to try to improve EMC shielding. Others may do it for something else of course.
Best Answer
This wasn't too hard too find. I am sure there are more.
searched ... 20-pin J-Link connector 8-pin 2x4
This adapter is designed to allow standard 20-pin ARM JTAG devices to connect to the FDI 10-pin mini-JTAG on µEZGUI units and ARM based SOMDIMM units.
with 100k Pullup to SWDIO and 100k Pulldown to SWCLK