SDED5-001G-NAT SanDisk, SDED5-001G-NAT Datasheet - Page 36

• Manufacturer Part Number: SDED5-001G-NAT
• Description: IC MDOC H3 1GB FBGA
• Manufacturer: SanDisk

Specifications of SDED5-001G-NAT

• Format - Memory: FLASH
• Memory Type: FLASH - Nand
• Memory Size: 8G (1G x 8)
• Interface: Parallel
• Voltage - Supply: 1.65 V ~ 1.95 V
• Operating Temperature: -25°C ~ 85°C
• Package / Case: 115-TFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Speed: -

Rev. 1.3
Static Wear-Leveling
Areas on the flash media may contain static files, characterized by blocks of data that remain
unchanged for very long periods of time, or even for the whole device lifetime. If wear-leveling
were only applied on newly written pages, static areas would never be cycled. This limited
application of wear-leveling would lower life expectancy significantly in cases where flash
memory contains large static areas. To overcome this problem, Embedded TrueFFS forces data
transfer in static areas as well as in dynamic areas, thereby applying wear-leveling to the entire
media.
6.3.4 Power Failure Management
Embedded TrueFFS uses algorithms based on “erase after write” instead of "erase before write"
to ensure data integrity during normal operation and in the event of a power failure. Used areas
are reclaimed for erasing and writing the flash management information into them only after an
operation is complete. This procedure serves as a check on data integrity.
The “erase after write” algorithm is also used to update and store mapping information on the
flash memory. This keeps the mapping information coherent even during power failures. The
only mapping information held in RAM is a table pointing to the location of the actual mapping
information. This table is reconstructed during power-up or after reset from the information
stored in the flash memory.
To prevent data from being lost or corrupted, Embedded TrueFFS uses the following
mechanisms:
In addition, Embedded TrueFFS applies a unique algorithm to ensure that new data written to the
device will not affect any data already programmed to the device.
6.3.5 Error Detection/Correction
Embedded TrueFFS implements a unique Error Correction Code (ECC) algorithm to ensure data
reliability. Refer to Section 3.5 for further information on the EDC/ECC mechanism.
6.3.6 Special Features through I/O Control (IOCTL) Mechanism
In addition to standard storage device functionality, the DOC Driver provides extended
functionality. This functionality goes beyond simple data storage capabilities to include features
such as: formatting the media, read/write protection, boot partition(s) access and other options.
This unique functionality is available in all DOC Drivers through the standard I/O control
command of the native file system.
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• When writing, copying, or erasing the flash device, the data format remains valid at
• A data sector cannot exist in a partially written state. The operation is either
all intermediate stages. Previous data is never erased until the operation has been
completed and the new data has been verified.
successfully completed, in which case the new sector contents are valid, or the
operation has not yet been completed or has failed, in which case the old sector
contents remain valid.
mDOC H3 EFD Featuring Embedded TrueFFS Data Sheet
Embedded TrueFFS Technology
92-DS-1205-10