Opal Kelly issues this PCN to existing customers of the listed product(s) to inform them of changes and/or updates that may affect current inventory or current and future applications of the product.
30 September 2022
The following items are affected by this PCN:
PCB revisions CXX and later are affected by this PCN. Revisions BXX and earlier are not affected by this change. The PCB revision is indicated in silkscreen in the location shown below.
Revisions BXX and earlier are not affected.
Revisions CXX and later are affected.
Reason for the Change
The XEM8320 revision BXX includes a dedicated JTAG programming and debug header (J3) which is compatible with several interface cables, including the Xilinx Platform Cable. Revision CXX has been updated with a USB-to-JTAG chipset which allows JTAG connection over USB-C without the need for a specialized cable.
Description of the Change
Revision BXX no longer includes JTAG header J3. Instead, JTAG is accessed using the vertical-launch USB-C connector J21 (labeled “USB JTAG” in silkscreen).
Although the physical JTAG header J3 has been removed from revision CXX, the footprint and FPGA connections are still included. To use the JTAG header, place Molex p/n 87831-1420 or equivalent at location J3.