Specifications

CoreModule/PC Technical Manual
2-22
n For cable length between 6 and 12 inches, use a high quality ribbon cable with a ground
plane, such as 3M part number 3353/64.
n Cable lengths greater than 12 inches are not recommended.
n Backplane Quality -- Be sure to use a high quality backplane having minimal signal crosstalk.
Use of power and ground planes and guard traces between bus signals are recommended.
n Termination -- If bus termination is required, use "AC" rather then "DC" (resistive)
termination. Placing 100 ohms in series with 100 pf between each signal and ground is
recommended. Do not use resistive termination.
n Reset and TC Deglitching -- Some expansion cards have asynchronous TTL inputs especially
vulnerable to noise and crosstalk. The active high RESET and TC lines are ones to watch out
for. If these signals are susceptible, a 200 pf to 500 pf capacitor connected between the signal
and ground can be used to prevent false resets. These RESET and TC deglitching capacitors are
included on the Ampro MiniBackplanes.