MD2202-D32-X-P SanDisk, MD2202-D32-X-P Datasheet - Page 17

• Manufacturer Part Number: MD2202-D32-X-P
• Manufacturer: SanDisk

Specifications of MD2202-D32-X-P

• Lead Free Status / RoHS Status: Compliant

6.
6.1
DiskOnChip 2000 can operate as the OS boot device. The DiskOnChip default firmware contains
drivers to enable it to perform as the OS boot device under DOS. For other OSs, please refer to the
TrueFFS driver readme file.
6.2
When used in PC-compatible platforms, DiskOnChip 2000 is connected to an 8KB memory
window in the BIOS expansion memory range, typically located between 0C8000H to 0EFFFFH.
During the boot process, the BIOS loads the TrueFFS firmware into the PC memory and installs
DiskOnChip 2000 as a disk drive in the system. When the operating system is loaded, DiskOnChip
2000 is recognized as a standard disk. No external software is required to boot from DiskOnChip
2000. Figure 6 illustrates the location of the DiskOnChip 2000 memory window in the PC memory
map.
After reset, the BIOS code first executes the Power On Self-Test (POST) and then searches for all
expansion ROM devices. When DiskOnChip 2000 is found, the BIOS code executes from it the IPL
(Initial Program Loader) code, located in the boot block. This code loads the TrueFFS driver into
system memory, installs DiskOnChip 2000 as a disk in the system, and then returns control to the
BIOS code. The operating system subsequently identifies DiskOnChip 2000 as an available disk.
TrueFFS responds by emulating a hard disk.
From this point onward, DiskOnChip 2000 appears as a standard disk drive. It is assigned a drive
letter and can be used by any application, without any modifications to either the BIOS set-up or the
autoexec.bat/config.sys files. DiskOnChip 2000 can be used as the only disk in the system, with or
without a floppy drive, and with or without hard disks.
The drive letter assigned depends on how DiskOnChip 2000 is used in the system, as follows:
•
17
If DiskOnChip 2000 is used as the only disk in the system, the system boots directly from it
and assigns it drive C.
B
Introduction
Boot Procedure in PC-Compatible Platforms
OOTING FROM
Figure 6: DiskOnChip 2000 Memory Window in the PC Memory Map
D
ISK
O
N
C
0FFFFFH
HIP
0C8000H
0B0000H
0F0000H
Data Sheet, Rev. 3.9
2000
Extended Memory
DiskOnChip
Display
BIOS
RAM
1M
640k
0
8k
DiskOnChip 2000 DIP
91-SR-002-42-8L