i was implementing an external bus interface module to use an external SRAM, but was having problems accessing all areas of the external SRAM.
the memory map(MMU configuration) EBI(external bus interface) settings are as follows.
TLB1 : 0x20000000 ~ 0x203FFFFF (4MB), CS0 => Allocation for 4MB external SRAM
TLB2: 0x20400000 ~ 0x205FFFFF (2MB), CS1
TLB3: 0x20600000 ~ 0x206FFFFF (1MB), Non-CS
TLB4: 0x20700000 ~ 0x207FFFFF (1MB), CS3
In the above configuration, i can only access 2MB area of the external SRAM(0x20000000 ~ 0x201FFFFF).
(If I access the 0x2020000 ~ 0x203fffff area, MOC5674F will shut down after a bus error is generated.)
why can not i access the rest of the external SRAM area(0x20200000 ~ 0x203FFFFF)?
Do I have to make additional settings besides the TLB setting and the EBI(chip select) setting? or am I only able to use 2MB due to a EBI constraints?