SMARC T335x Carrier Board Hardware Design Guide, Document Revision 1.2
2.4.2. Parallel RGB LCD Implementation Guide
2.4.2.1. LCD Data Line
The parallel RGB interface can cause problems with EMC compliance
when used with a high pixel clock frequency. This can be made worse if a
display is connected over flat flex cables. Therefore, the flat flex cables
should be kept as short as possible. Series resistors in the data lines
reduce the slew rate of the signals which reduces the radiation problem
but can introduce signal quality and timing problems. The serial resistor
value is a trade-off between reduction of electromagnetic radiation and
signal quality. A good starting value is 33ohm.
Figure 17: LCD Data Line with Serial Resistors
