I'm now trying to figure out how much SDRAM I can attach to these MCUs.
The datasheet of the S70 does not specify what type of SDRAM (DDR2, DDR3) etc. it can handle. How do I know what memory chips are compatible?
Browsing through digitec, I noticed that almost all (?) 1G memory chips have 8 banks, which is more than the SAM S70 can handle (4 banks max). And all the chips that I found that offer 1G on 4 banks are DDR1 only. Is the amount of data per bank somehow limited?
Also I am unsure how much data the memory controller on the SAMS S70 can adress per bank (row / column adresses) and in total. If I read the datasheet correctly, the biggest address is 13 bits of row address, 11 bits of column address + 1 bit byte offset + 2 bit bank address, i.e. 27 address bits in total.. that would be 1/8 of 1G, i.e. 128M?
Where does Page size play into this?
I know that these are many questions but I am quite overwhelmed by the amount of memory configurations and the limited information in the datasheets doesn't help.