Detailed descriptions
16.3 System resources
SIMATIC HMI IPC677C
220 Operating Instructions, 04/2013, A5E02722710-04
Exclusive interrupt in PIC mode
The interrupts are automatically assigned to the slots at system startup due to the default
settings in system BIOS.
Several slots may share the same interrupt, depending on the system configuration. This
functionality is known as interrupt sharing. Exclusive interrupts are not available in PIC
mode. Disable specific system resources in order to obtain exclusive interrupts. BIOS
assigns the PIC interrupts at random during restart of the system.
16.3.2.4 Memory address assignments
PCI VGA modules can be operated with expansion ROM up to 48K.
Address
from 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 Software graphics / text
refresh memory
Not used
000B 8000 000B FFFF 32K VGA graphics/text refresh
memory
000C 0000 000C BFFF 48K VGA BIOS expansion
000C 0000 000C FFFF 64K VGA BIOS Always occupied or
reserved
000E 0000 000FFFF 2 x 64K DMI data, System BIOS,
Options ROMs: PXE, RAID
0010 0000 CFFF FFFF 3.2GB System memory 4 GB
memory configuration
Depends on memory
configuration
D460 0000 D460 0FFF 4K Motherboard resources
F000 0000 F3FF FFFF 64M Motherboard resources
FED0 0000 FED0 03FF 1K High Precision Event Timer
FED1 0000 FED1 3FFF 16K Motherboard resources
FED1 8000 FED1 8FFF 4K Motherboard resources
FED1 9000 FED1 9FFF 4K Motherboard resources
FED1 C000 FED1 FFFF 16K Motherboard resources
FED2 0000 FED3 FFFF 128K Motherboard resources
FED9 0000 FED9 3FFF 16K Motherboard resources
FEE0 0000 FEEF FFFF 1M Motherboard resources
FF00 0000 FFFF FFFF 16M Motherboard resources
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