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The JTAG interface is avaliable in CYW20719. Please refer to the document in the WICED SDK which is located in the 20719-B1_Bluetooth/doc file: CYW207x9-JTAG-Debugging.pdf and CY9207x9WCDEVAL-Schematic.pdf.
We recommand you to program and debug with the HCI UART.
What document in WICED should we refer to for programming the CYW20719 chip in our own design and doing testing?
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The device is usually programmed through the HCI UART. You can refer to the CYW920719Q40EVB_01-BaseBoard-Schematic.pdf, CYW920719Q40EVB_01-CarrierBoard-Schematic.pdf and CYW9207x9WCDEVAL-Schematic.pdf for your design.
For the test, you may refer to the mbt tool in wiced_tools/mbt. Refer to the readme.text for how to use the mbt tool.