Revision 1.4 will be replaced with 1.5 which will adapt a different JTAG connector. The new connector will allow the Atmel SAM-ICE debugger to connect directly to the openTPM. A cable does not exist that allows the TAG CONNECT to plug directly into the SAM-ICE debugger.
This revision forgoes all 0201 components for 0402 resistors and capacitors. Trace width was increased for power supply lines and JTAG connections. The JTAG’s voltage reference line is now connected to the TAG CONNECT footprint. Ground footprint was optimized for the bottom and inner-signal layer.