Siemens SIMATIC PG 720, Руководство пользователя

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8
8-2
PG 720 Programming Device
C79000-G7076-C720-02
8.1 Hardware Address Table
There are two kinds of address area:
S
Memory address area
S
I/O address area.
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.
Table 8-1 Assignment of the 4 Gbyte Memory Address Area.
Memory
Adresses
Memory Address Assignment
0000 0000 to
0009 FFFF 640 KB system memory on the motherboard
System data, operating system, drivers, and programs
000A 0000 to
000B FFFF 128 KB refresh memory for monitor interface module. Only part or
the whole of the memory area is used depending on the interface
module and operating mode.
000C 0000 to
000C BFFF Not assigned
000C C000 to
000C CFFF Reserved for the MPI
000C D000 to
000C FFFF Not assigned
000D 0000 to
000D FFFF Not assigned or reserved for PCMCIA, when the PCMCIA driver
is loaded.
000E 0000 to
000F FFFF 128 KB max. ROM on the motherboard
(VGA BIOS, Power Management)
0010 0000 to
003F FFFF 3 MB DRAM system memory in the basic configuration
(virtual diskette or ”protected mode” operating systems)
0040 0000 to
01FF FFFF 32 MB DRAM system memory expansion
(virtual diskette or ”protected mode” operating systems)
0200 0000 to
FFDF FFFF Reserved
FFFE 0000 to
FFFF FFFF 128 KB shadow of the area 000E 0000 to 000F FFFF
Table 8-2 I/O Address Assignments
I/O Addresses Chip/Module Hardware
Interrupt Used
0000 H-001F H DMA controller 1 (8237)
0020 H-0021 H Interrupt controller 1 (master/8259)
0022 H-0023 H Not used
0024 H-0025 H Configuration index
Hardware Information