MD3331-D64-V3-X SanDisk, MD3331-D64-V3-X Datasheet - Page 42

• Manufacturer Part Number: MD3331-D64-V3-X
• Manufacturer: SanDisk
• Type: Flash Diskr

Specifications of MD3331-D64-V3-X

• Density: 64MByte
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Package Type: FBGA
• Mounting: Surface Mount
• Pin Count: 69
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.5V
• Operating Supply Voltage (max): 3.6V
• Programmable: Yes
• Lead Free Status / Rohs Status: Not Compliant

8.
8.1
Mobile DiskOnChip Plus can function both as a flash disk and the system boot device. If
DiskOnChip is configured as a flash disk, it can operate as the OS boot device. DiskOnChip default
firmware contains drivers to enable it to perform as the OS boot device under DOS (see
Section 8.2). For other OSs, please refer to the readme file of the TrueFFS driver.
If Mobile DiskOnChip Plus is configured as a flash disk and as the system boot device, it contains
the boot loader, an OS image and a file system. In such a configuration, Mobile DiskOnChip Plus
can serve as the only non-volatile device on board. Refer to Section 8.3.2 for further information on
boot replacement.
8.2
When used in PC-compatible platforms, Mobile DiskOnChip Plus 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
Mobile DiskOnChip Plus as a disk drive in the system. When the operating system is loaded,
Mobile DiskOnChip Plus is recognized as a standard disk. No external software is required to boot
from Mobile DiskOnChip Plus.
Figure 13 illustrates the location of the Mobile DiskOnChip Plus 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 Mobile DiskOnChip Plus is located, the BIOS code executes from
it the IPL code, located in the XIP portion of the Programmable Boot Block. This code loads the
TrueFFS driver into system memory, installs Mobile DiskOnChip Plus as a disk in the system, and
then returns control to the BIOS code. The operating system subsequently identifies Mobile
DiskOnChip Plus as an available disk. TrueFFS responds by emulating a hard disk.
42
B
Introduction
Boot Procedure in PC-Compatible Platforms
OOTING FROM
Figure 13: Mobile DiskOnChip Plus Memory Window in PC Memory Map
M
OBILE
D
0FFFFFH
0C8000H
0B0000H
0F0000H
ISK
Data Sheet, Rev. 1.8
O
N
Extended Memory
C
DiskOnChip
HIP
Display
BIOS
RAM
P
LUS
1M
640k
0
8k
Mobile DiskOnChip Plus 16/32MByte
95-SR-000-10-8L