I'm designing a board with Allwinner A64 processor and i'm confused in choosing the proper RAM. the SDRAM controller characteristics of the processor is listed as follows:
- Compatible with JEDEC standard DDR2 /DDR3 /DDR3L/LPDDR2/LPDDR3 SDRAM
- Support clock frequency up to 667MHz(DDR3-1333)
- Support 2 chip selects
- Up to 3GB address space
- 32-bits bus width
- 16 address signal lines and 3 bank signal lines
- Support Memory Dynamic Frequency Scale(MDFS)
I need to choose a 1GB LPDDR3 SDRAM. the question is that is it possible to use a DDR3-1866 RAM(for example Samsung_K4E8E324EB-AGCF)? In fact I don't expect the processor to interact with the ram with 1866 data-rate. i just want to know if the processor works with a higher data-rate ram but it just use the processor's last data-rate ability(DDR3-1333 in this case).
if it's not possible, any other suggestion would be appreciated. in banana pi BPI-M64 4 separate 512MB Micron RAMs with 8-bit BUS are used to create a 2GB RAM. but the model of Ram is not specified and i can't find it anywhere.