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HDR -> single buffer, and then
two series termination resistors on the buffer output to produce two copies of TCK and TMS.
Each of the two series terminated signals will have reflections, but those reflections will occur off the
single load at the end of the transmission line. The return reflection will be absorbed by the series termination resistor.
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Makes perfect sense now. I can even see where to put the resistors in terms of layout: near the buffer. I'll go with 100 Ohms for this, as your schematic suggests.
It might also be a good idea to put this on the SPI daisy chain.
What book would you recommend for understanding transmission line effects on a PCB?
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