ECP3: How close can the DDR2 (double data rate) memory be placed to the LatticeECP3-35 device while designing a PCB?
The DDR2 (double data rate) memory PCB trace length should be equal to or less than 3.0'' for the LatticeECP3-35 device. It is recommended to have an even shorter than 3.0'' trace length for the DDR2 memory to achieve better results.