Hello,
I've been going over the datasheet documentation related to LPDDR interface, specifically with respect to the SI terminations. The datasheet indicates no termination is required on this interface as long as the routing rules, keep-outs and recommended stack up is observed. It then goes further to state that some may still want to include terminations in case emissions are a problem.
In our application, we will use an AM3703 with a 32 bit wide LPDDR, and we intend to place it as close the LPDDR interface pins as possible while still allowing it to be routed. Internally we have been arguing whether or not to include the terminations, since we don’t know for sure whether or not emissions will be a problem. We’ve speculated that since the routes will be so short in a termination-less design, the added trace length the termination resistors would cause, along with the vias required to punch the lines to the surface layers, may in fact make things worse.
Based on past experience with these devices, does omitting the termination resistors for our design seem to make sense?
Thanks - AM
