gEDA-user: series terminators

[DJ Delorie <dj@xxxxxxxxxxx>]

I'm thinking I should design in some series resistors on the address
and data lines for my RAM expansion board (30MHz, about 6" of 8 mil
trace on DS FR4, 5v).  How does one go about calculating an ideal
resistance?  The mcu spec doesn't have a min rise time spec, the ram
chips are 20ns (50MHz) and imply they want a 3ns rise time.

I figure I can put in zero-ohm resistors for now, and experiment with
one of the lines, but I'd rather just come close enough on the first
try ;-)


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