Page 40
AmITX-HL-G
7.
System Resources
7.1.
System Memory Map
Address Range (decimal)
Address Range (hex)
Size
Description
(4GB-2MB)
FFE00000 – FFFFFFFF
2 MB
High BIOS Area
(4GB-18MB) – (4GB-17MB-1)
FEE00000 – FEEFFFFF
1 MB
MSI Interrupts
(4GB-20MB) – (4GB-19MB-1)
FEC00000 – FECFFFFF
1 MB
APIC Configuration Space
15MB – 16MB
F00000 – FFFFFF
1 MB
ISA Hole
1MB -15MB
100000 - EFFFFF
14MB
Main Memory
0K –1MB
00000 – FFFFFF
1MB
DOS Compatibility Memory
7.2.
Direct Memory Access Channels
Channel Number
Data Width
System Resource
0 8-bits
Generic
1 8-bits
Generic
2 8-bits
Generic
3 8-bits
Generic
4
Reserved - cascade channel
5 16-bits
Generic
6 16-bits
Generic
7 16-bits
Generic
7.3.
I/O Map
7.3.1.
I/O Map
Hex Range
Device
000-01F
DMA controller 1, 8237A-5 equivalent
020-02D and 030-03F
Interrupt controller 1, 8259 equivalent
02E-02F
LPC SIO () configuration index/data registers
040-04D and 050-05F
Timer, 8254-2 equivalent
04E-04F
UART index/data registers
060, 062, 064, 066, 068-06F
8742 equivalent (keyboard)
061, 063, 065, 067
NMI control and status
070-07F
Real Time Clock Controller( bit 7 -NMI mask)
080-091
DMA page register
092
Reset (Bit 0)/ Fast Gate A20 (Bit 1)
93-9F
DMA page registers continued
0A0-0B1 and 0B4-0BF
Interrupt controller 2, 8259 equivalent
0B2 and 0B3
APM control and status port respectively
0C0-0DF
DMA controller 2, 8237A-5 equivalent
