Siemens SIMATIC Rack PC 840 V2 - Memory Address Assignments

Detailed descriptions
16.4 System resources
SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
16-21
16.4.2.3 Memory address assignments
PCI VGA modules can be operated with an expansion ROM of a size up to 48 K.
Address
from up to
Size Description of the basic
function
Possible alternative
function
0000 0000 0007 FFFF 512K Conventional system
memory
0008 0000 0009 F7FF 127k Conventional system
memory extended
0009 F800 0009 FFFF 2K XBDA, extended Bios Data
Area
000A 0000 000A FFFF 64K VGA graphics refresh
memory
Shared SMM for power
management
000B 0000 000B 7FFF 32K Monochrome graphics/text
refresh memory
Unused
000B 8000 000B FFFF 32K VGA graphics/text refresh
memory
000C 0000 000C BFFF 48K VGA-BIOS expansion
000C C000 000C FFFF 16K USB Always occupied
000D 0000 000E 7FFF 96K
1)
unused (device driver or ISA
hardware)
via EMM High DOS
Memory
000D 0000 000D 97FF 38K
2)
RAID
000D 0000 000D 93FF 37K
2)
SATA RAID
000D 9400 000E 97FF 65K
2)
Unused
000D 9800 000E 97FF 64K
2)
Unused
000D 0000 000D 65FF 26K
2)
SCSI
000D 65FF 000E 97FF 76K
2)
Unused
000E 8000 000F FFFF 96K
2)
System BIOS
000E 9800 000F FFFF 96K
2)
System BIOS
0010 0000 00EF FFFF 14M System memory
00F0 0000 00FF FFFF 16M-15M=1M System memory or memory
hole
Via ISA memory setup
(memory hole)
0100 0000 7FFF FFFF Max. 2 GB -
16 MB
System memory, 512
Kbytes of top of memory are
reserved for USB.
Depends on memory
configuration
7000 0000 FFF7 FFFF PCI memory address space For PCI expansion
cards
FFF8 0000 FFFF FFFF Firmware HUB