2244 - LatticeECP3: I need to use four chip select signals while the Lattice DDR3 controller
IP core supports only up to two. Can I extend the number of chip select
from the core?
Description:
No. Lattice DDR3 controller IP core does not support more than 2 chip
selects. The IP core was designed and validated to support upto two
ranks of DDR3 memory configurations. Since each rank is controlled by a
corresponding chip select signal, the core provides up to two chip
select signals. Therefore, it is not possible to extend the number of
chip selects to more than two. Consider doubling the memory
density as to have the same effect as doubling the rank size. It is
preferred to implement smaller ranks in a DDR3 interface because of less
loading with faster signal transitions allowing higher bandwidth with
more reliable transactions.