Technical Reference; Introduction; Memory Map; System Memory Map - Intel D845EPI Specification

2 Technical Reference

What This Chapter Contains
2.1

Introduction.................................................................................................................37

2.2

Memory Map ..............................................................................................................37

2.3 Fixed I/O Map.............................................................................................................38
2.4 DMA Channels ...........................................................................................................39
2.5 PCI Configuration Space Map ....................................................................................39
2.6 Interrupts ....................................................................................................................40
2.7 PCI Interrupt Routing Map ..........................................................................................41
2.8 Connectors .................................................................................................................43
2.9 Jumper Blocks............................................................................................................54
2.10 Mechanical Considerations.........................................................................................56
2.11 Electrical Considerations ............................................................................................58
2.12 Thermal Considerations..............................................................................................59
2.13 Reliability ....................................................................................................................61
2.14 Environmental ............................................................................................................61
2.1 Introduction
Sections 2.2 - 2.6 contain several standalone tables. Table 11 describes the system memory map,
Table 12 shows the I/O map, Table 13 lists the DMA channels, Table 14 defines the PCI
configuration space map, and Table 15 describes the interrupts. The remaining sections in this
chapter are introduced by text found with their respective section headings.
2.2 Memory Map
Table 11.

System Memory Map

Address Range (decimal)
1024 K - 2097152 K
960 K - 1024 K
896 K - 960 K
800 K - 896 K
640 K - 800 K
639 K - 640 K
512 K - 639 K
0 K - 512 K
Address Range (hex)
100000 - 7FFFFFFF
F0000 - FFFFF
E0000 - EFFFF
C8000 - DFFFF
A0000 - C7FFF
9FC00 - 9FFFF
80000 - 9FBFF
00000 - 7FFFF
Size Description
2047 MB Extended memory
64 KB Runtime BIOS
64 KB Reserved
96 KB Available high DOS memory (open
to the PCI bus)
160 KB Video memory and BIOS
1 KB Extended BIOS data (movable by
memory manager software)
127 KB Extended conventional memory
512 KB Conventional memory
37