Follow these PCB layout guidelines for
the DSI LVDS interface to ensure proper DSI operation.
- Route the differential clock and
data lines to match 50-Ω single-ended and 100-Ω differential impedance.
- The length of dp and dn should be
matched. If that is not possible, ensure that dp is only slightly longer than dn
(delta delay not to exceed 8-10 ps), especially for the clock-lane. This is to
prevent propagation on the clock lane during the HS to LP transition.
- No thru-hole vias permitted on
high-speed traces.
- Create trace routes on top or
bottom layers preferably.
- Must have a ground reference
plane.
- Avoid power plane transitions in
upper or lower layers.
- Avoid using SMD (surface mount
device) resistors larger than 0402. If resistors are used in the traces, ensure
that the layer below has a void.
- No thru-hole SMA (SubMiniature
version A) connectors.
- Minimize trace length as much as
possible.
- Perform signal integrity
simulations to ensure board performance.