In the case of the existing SPEC and SVEC carriers, FMC JTAG these pins go the FPGA, so we can for example program an FMC mezzanine using the JTAG pins.

In the case of the upcoming SPEC7, they only go to the JTAG connector of the carrier, which would prevent future in-system upgrades of the CPLD for FMC-ADC-1GSPS plugged on a SPEC7.

Need a JTAG muliplexer?