MD5811-D256-V3Q18-X SanDisk, MD5811-D256-V3Q18-X Datasheet - Page 58

• Manufacturer Part Number: MD5811-D256-V3Q18-X
• Description: IC MDOC P3 256MB 48-TSOP
• Manufacturer: SanDisk

Specifications of MD5811-D256-V3Q18-X

• Format - Memory: FLASH
• Memory Type: FLASH - Nand
• Memory Size: 256M (32M x 8)
• Speed: 55ns
• Interface: Parallel
• Voltage - Supply: 2.5 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

9.
9.1
Mobile DiskOnChip P3 can function both as a flash disk and as the system boot device. Mobile
DiskOnChip P3 default firmware contains drivers to enable it to perform as the OS boot device
under DOS (see Section 9.2). For other OSs, please refer to the readme file of the TrueFFS driver.
If Mobile DiskOnChip P3 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 P3 can
serve as the only non-volatile device on board. Refer to Section 9.3.2 for further information on
boot replacement.
9.2
When used in PC-compatible platforms, Mobile DiskOnChip P3 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 P3 as a disk drive in the system. When the operating system is loaded, Mobile
DiskOnChip P3 is recognized as a standard disk. No external software is required to boot from
Mobile DiskOnChip P3.
Figure 16 illustrates the location of the Mobile DiskOnChip P3 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 P3 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 P3 as a disk in the system, and
then returns control to the BIOS code. The operating system subsequently identifies Mobile
DiskOnChip P3 as an available disk. TrueFFS responds by emulating a hard disk.
From this point onward, Mobile DiskOnChip P3 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
55
B
Introduction
Boot Procedure in PC-Compatible Platforms
OOTING FROM
Figure 16: Mobile DiskOnChip P3 Memory Window in PC Memory Map
M
OBILE
D
0FFFFFH
0C8000H
0B0000H
0F0000H
ISK
Data Sheet, Rev. 0.3
O
N
Extended Memory
C
DiskOnChip
HIP
Display
BIOS
RAM
P3
1M
640k
0
8k
Mobile DiskOnChip P3
93-SR-009-8L