Intel BOXDC53427HYE specifications Memory Resources, Addressable Memory

2Technical Reference

2.1Memory Resources

2.1.1Addressable Memory

The board utilizes 16 GB of addressable system memory. Typically the address space that is allocated for PCI Conventional bus add-in cards, PCI Express configuration space, BIOS (SPI Flash device), and chipset overhead resides above the top of DRAM (total system memory). On a system that has 16 GB of system memory installed, it is not possible to use all of the installed memory due to system address space being allocated for other system critical functions. These functions include the following:

•BIOS/SPI Flash device (128 Mb)

•Local APIC (19 MB)

•Direct Media Interface (40 MB)

•PCI Express configuration space (256 MB)

•PCH base address registers PCI Express ports (up to 256 MB)

•Memory-mapped I/O that is dynamically allocated for PCI Express add-in cards (256 MB)

The board provides the capability to reclaim the physical memory overlapped by the memory mapped I/O logical address space. The board remaps physical memory from the top of usable DRAM boundary to the 4 GB boundary to an equivalent sized logical address range located just above the 4 GB boundary. Figure 8 shows a schematic of the system memory map. All installed system memory can be used when there is no overlap of system addresses.

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