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Enabling JTAG comms on the UCD3138 series

説明

2016年 3月 14日
On startup, checksum tests are executed by the boot ROM code to verify the integrity of the program flash contents. If any tests pass, JTAG comms are disabled by the boot ROM code before control is relinquished to the firmware in program flash. This tutorial shows the line of code that you need to insert in your firmware to re-enable JTAG comms and the modification available via PMBus to the IOMUX register on the UCD device to re-enable JTAG comms. 

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