Intel E3815 FH8065301567411 Data Sheet

Intel

®

 Atom™ Processor E3800 Product Family

72

Datasheet

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 

 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.

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 
below figure.

Low DRAM

High MMIO

Low MMIO

High DRAM

BMBOUND

(F0000h to FFFFFh)

(E0000h to EFFFFh)

(A0000h to BFFFFh)