Address Mapping - Toshiba TX49 TMPR4937 Manual

9.3.2

Address Mapping

9.3.2.1 Physical Address Mapping
It is possible to map each of the four channels to an arbitrary physical address using the Base
Address field (SDCCRn.BA[35:21]) of the SDRAM Channel Control Register and the Address
Mask Field (SDCCRn.AM[35:21]).
The channel that becomes True in the following equation is selected.
paddr[35:21] & !AM[35:21] = BA[35:21] & !AM[35:21]
In the above equation, "paddr" represents the accessed physical address, "&" represents the
AND of each bit, and "!" represents the logical NOT of each bit.
Operation is undefined when multiple channels are simultaneously selected, or when external
bus controllers or PCI controllers are simultaneously selected.
Chapter 9 SDRAM Controller
9-4