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Enzians have an on-board JTAG controller (sometimes also called JTAG adapter or probe). It is brought out on the rear I/O panel of the machines as a USB type B connector. All the cluster machines' JTAG ports are connected to enzian-gateway which runs the Xilinx hardware server so the boards' scan chains can be accessed remotely. The JTAG cable IDs are listed on the cluster info page on the Enzian website. Be careful when accessing JTAG to use the correct IDs. There is currently no mechanism that ensures you access only JTAG ports of machines that you have reserved. 



Scan Chain

There are several devices on the Enzian boards that have JTAG (cf.  schematics p117). Some of them can be put in the USB scan chain: