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Isolating JTAG with ADUM3400

Hi everybody,

actually I'm trying to isolate the JTAG-Ports of teh ADSP-BF537 with 2 ADUM3400.

But there are several problems.

If I bypass TCK and TDO , so just TMS, EMU, TRST and TDI are isolated, everything works fine.

If I isolate any of the other two signals I get an error in VDSP: "Visual DSP has detected 2 devices in the JTAG chain".

Has anyone an idea? I use the ADDS-HPUSB-ICE emulator.

Thanks.

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