Intel BOXD955XBKLKR Product Specification - Page 45
Technical Reference
UPC - 735858173803
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2 Technical Reference What This Chapter Contains 2.1 Memory Resources ...45 2.2 DMA Channels ...47 2.3 Fixed I/O Map...48 2.4 PCI Configuration Space Map 49 2.5 Interrupts ...50 2.6 PCI Conventional Interrupt Routing Map 51 2.7 Connectors...53 2.8 Jumper Block ...67 2.9 Mechanical Considerations 68 2.10 Electrical Considerations 71 2.11 Thermal Considerations 73 2.12 Reliability...75 2.13 Environmental ...76 2.14 Regulatory Compliance 77 2.1 Memory Resources 2.1.1 Addressable Memory The board utilizes 8 GB of addressable system memory. Typically the address space that is allocated for PCI Conventional bus add-in cards, PCI Express configuration space, BIOS (firmware hub), and chipset overhead resides above the top of DRAM (total system memory). On a system that has 8 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/firmware hub (2 MB) • Local APIC (19 MB) • Digital Media Interface (40 MB) • Front side bus interrupts (17 MB) • PCI Express configuration space (256 MB) • MCH base address registers, internal graphics ranges, PCI Express ports (up to 512 MB) • Memory-mapped I/O that is dynamically allocated for PCI Conventional and PCI Express add-in cards 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 16 shows a schematic of the system memory map. All installed system memory can be used when there is no overlap of system addresses. 45