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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.
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The value will be somewhere around 30-ohms. I generally put whatever is the closest part in the BOM for a board. Its not really important to get it right on the first revision of the board. You'll measure it, try a few different values, and settle on the one that looks good.
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It might also be a good idea to put this on the SPI daisy chain.
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Its always a good idea to have point-to-point transmission lines when you can.
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What book would you recommend for understanding transmission line effects on a PCB?
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I liked the book by Johnson&Graham, "High Speed Digital Design: A Handbook of Black Magic", 1993.
Cheers,
Dave
Honored Contributor
