#1. In the EMIF tools, TI recommend output driver impedance CLK, DQS is 44ohm, but on datasheet, single ending impedance range is 50- to 75ohm, +-5ohm, should it at least 45ohm?
#2. About the PCB delay, customer wants to compatible with 2 PCB vendor, the two vendor's PCB Dielectric parameters are different. one is 181.604ps/inc, one is 171.556 ps/inc. which result in difference in Seed values.
Can the two PCB use one parameter?