Assignment Of The Memory Addresses - Siemens SIMATIC RI 45 PIII Series Manual

Motherboard
2.9.2

Assignment of the Memory Addresses

There are two kinds of address areas:
Different read/write signals (I/O WR, I/O RD, MEMR, MEMW) are used to
reference these areas. The following tables provide you with an overview of
the address areas used. Please refer to the descriptions of the individual
functional groups for more details.
Table 2-2 Assignments of the Memory Addresses
From To
Address Address
0000 0000 0007 FFFF 512k
0008 0000 0009 FBFF 127k
0009 FC00 0009 FFFF 1k
000A 0000 000A FFFF 64k
000B 0000 000B 7FFF 32k
000B 8000 000B FFFF 32k
000C 0000 000C C7FF 32k
000C C800 000D FFFF 96k
000E 0000 000E BFFF 48k
000E C000 000E CFFF 4k
000E D000 000E DFFF 4k
000E E000 000E FFFF 8k
000F 0000 000F FFFF 64k
0010 0000 00EF FFFF 14M
00F0 0000 00FF FFFF 1M
0100 0000 2FFF FFFF 768M
3000 0000 FFEF FFFF 4G-768M-
1023k
FFF0 0000 FFFD FFFF 1023k-128k
FFFE 0000 FFFF FFFF 128k
2-26
Memory address area
I/O address area.
Size Assignment
Conventional system memory
Conventional system memory
extended
Conventional system memory
extended BIOS data
Graphics refresh memory
SW graphics interface module
Graphics refresh memory
VGA BIOS expansion
Vacant
System BIOS
System BIOS BootMessageLogo
System BIOS Plug & Play Area
System BIOS Boot Block
System BIOS
Extended system memory
Extended system memory or
Memory hole
Extended system memory
PCI expansion; resources are assi-
gned by the operating system.
ISA memory, reserved for dual-
port RAM
Shadow of System BIOS
(000E 0000 .. 000F FFFF)
Remark
VGA
Vacant
VGA/CGA
VGA
Via BIOS SETUP
Vacant
RI 45 PIII, Manual
C79000-G7076-C817-01