Intel G1620T CM8063701448300 Manual Do Utilizador
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Códigos do produto
CM8063701448300
Datasheet
51
Mapping Address Spaces
Accesses in the 256 MB PCI ECAM range, starting at BECREG, generate enhanced PCI
configuration register accesses when enabled (BECREG.ECENABLE). Unlike traditional
memory writes, writes to this range are non-posted when enabled. See
configuration register accesses when enabled (BECREG.ECENABLE). Unlike traditional
memory writes, writes to this range are non-posted when enabled. See
for more details.
All other downstream accesses in the Low MMIO range are sent to the IO Fabric for
further decode based on PCI resource allocations. The IO Fabric’s subtractive agent (for
unclaimed accesses) is the Platform Controller Hub.
further decode based on PCI resource allocations. The IO Fabric’s subtractive agent (for
unclaimed accesses) is the Platform Controller Hub.
4.1.1.2
DOS DRAM
The DOS DRAM is the memory space below 1 MB. In general, accesses from a
processor targeting DOS DRAM target system DRAM. Exceptions are shown in the
following figure.
processor targeting DOS DRAM target system DRAM. Exceptions are shown in the
following figure.
Figure 4.
Physical Address Space – DOS DRAM
Low DRAM
DOS DRAM
High MMIO
Low MMIO
4 GB
64 GB
1 MB
Physical Address
Space
High DRAM
BMBOUND
VGA/CSEG
64 KB
(F0000h to FFFFFh)
PROM ‘F’ Segment
PROM ‘E’ Segment
64 KB
(E0000h to EFFFFh)
128 KB
(A0000h to BFFFFh)