Справочник Пользователя для Intel J1850 FH8065301455200
Модели
FH8065301455200
Datasheet
49
Mapping Address Spaces
are accomplished by moving a section DRAM to start at the fixed 4 GB boundary,
leaving a hole below 4 GB for MMIO. This creates the following distinct memory
regions:
leaving a hole below 4 GB for MMIO. This creates the following distinct memory
regions:
•
DOS DRAM + Low DRAM
•
Low MMIO
•
High DRAM
•
High MMIO
There are two registers used to create these regions – BMBOUND and BMBOUND_HI.
Their use is shown in
Their use is shown in
Figure 2.
Physical Address Space – DRAM & MMIO
Low DRAM
High DRAM
DOS DRAM
Low DRAM
DOS DRAM
High MMIO
Low MMIO
4 GB
64 GB
1 MB
Physical Address
Space
DRAM Address
Space
BMBOUND_HI
BMBOUND
High DRAM