18
158004.B00
executed from the 32-bit wide SDRAM, much faster than it would be from the Flash
chip. Section 6.3 contains further information on BIOS extensions.
2.5
MEMORY ADDRESS MAP
Table 2 shows the memory map as configured by the standard BIOS of the TP400.
This table shows the bottom 1M byte address space. Extra SDRAM is located
immediately above the 1M byte boundary. Memory accesses beyond the top of the
SDRAM are performed on the PCI bus.
ADDRESS
MEMORY DEVICE DECODED
MEMORY SIZE
FFFFF
E8000
BIOS in Flash Chip - copied to shadow
SDRAM memory during the boot sequence.
96K
E7FFF
E0000
This space is reserved for the Flash memory
programming program and the Flash File
System.
32K
DFFFF
D0000
Available for PC/104 memory mapped
boards. BIOS Extension code can be located
here and optionally shadowed in SDRAM.
64K
CFFFF
CC000
The Flash File System BIOS extension is
initially located here, before it copies itself to
low memory. Available for PC/104 bus
memory mapped boards if the FFS is not
used.
16K
CBFFF
C8000
Available for PC/104 memory mapped
boards. BIOS Extension code can be located
here and optionally shadowed in SDRAM.
16K
C7FFF
C0000
Usually VGA BIOS, which is copied from
Flash chip to shadow SDRAM at this
address. Alternatively used by VGA BIOS on
PC/104 or PC/104-Plus bus that can also be
shadowed.
32K
BFFFF
A0000
Usually allocated to VGA memory.
128K
9FFFF
00000
SDRAM
640K
TABLE 2 - TP400 ADDRESS MAP - FIRST 1M BYTE
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Страница 136: ...J2 164004 C03 FIGURE J1 TP400ET MECHANICAL DRAWINGS FIGURE J2 TP400ET CIRCUIT DIAGRAM ...
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