參數(shù)資料
型號: 21890
英文描述: ?lanSC300 Evaluation Board User's Manual
中文描述: ?lanSC300評估板用戶手冊
文件頁數(shù): 82/162頁
文件大?。?/td> 1974K
代理商: 21890
élanSC300 Microcontroller Evaluation Board User’s Manual
4-10
1
Table 4-2. Typical Full ISA Memory Map
NOTE:
1. In the above configuration, MMSB is disabled, and MMSA is defined to start
at base address C0000h (i.e., élanSC300 Index 6Dh=00).
2. MMSA pages 0 and 1 are disabled allowing accesses to the address range at
C0000h–C7FFFFh to propagate to the ISA bus where the VGA BIOS is located.
3. Addresses E0000h–FFFFFh are set up as linear decodes to the BIOS ROM
(Index 65h, bit 0=0, bit 1=1, bit 2=0, bit 3=0). During BIOS initialization, if
shadowing is enabled (élanSC300 Index 65h bit 4=1, élanSC300 Index
69h=FFh), then accesses to this address range go to DRAM.
4. Refer to the
élanSC300 Microcontroller Programmer’s Reference Manual
for
information on ROM BIOS and ROM DOS accesses using the MMS pages.
386
Physical
Address
1FFFFFh–
100000h
FFFFFh–
E0000h
Memory Type Accessed
Special Notes
DRAM.
BIOS ROM (ROMCS).
64K BIOS image + ROM-DOS kernel.
ROMCS is set up for lin-
ear decode. May be shad-
owed to DRAM.
MMSA page 4–7.
DFFFFh–
D0000h
CFFFFh–
CC000h
CBFFFh –
C8000h
C7FFFh–
C0000h
PCMCIA slots.
Controlled by socket services.
Application ROM (DOSCS).
Used by ROM-DOS.
DRAM at offset C8000h–CBFFFh.
Used for SMM save state area.
ISA bus.
VGA card 32K BIOS ROM.
MMSA page 3.
MMSA page 2.
MMSA pages 0 & 1. Dis-
abled to allow accesses to
pass through to ISA bus.
MMSB is disabled which
allows accesses to propa-
gate to ISA bus.
BFFFFh –
A0000h
ISA bus.
VGA card display buffers.
9FFFFh –
00000h
DRAM.
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