SLUFD1GU2U STEC, SLUFD1GU2U Datasheet - Page 8

• Manufacturer Part Number: SLUFD1GU2U
• Manufacturer: STEC

Specifications of SLUFD1GU2U

• Lead Free Status / RoHS Status: Compliant

SLUFDxGU2U(I)
Industrial Grade USB Flash Drive
Datasheet
3.1.2 Controller external components
In addition to the functional blocks shown in Figure 3, the Industrial Grade UFD has the following external
components:
 SLC NAND Flash for the most reliable data storage.
 Crystal Oscillator 12Mhz, as the main clock source.
3.2
Flash Management
Since the Industrial Grade UFD provides a standard USB interface to the host, no software integration is
required, providing the shortest time-to-market for design engineers.
The firmware of the embedded USB 2.0 controller contains STEC’s advanced flash memory management
algorithms to ensure the most optimum device performance, reliability and endurance. It was designed to
maximize the benefits of flash memory, while at the same time overcoming inherent NAND flash
limitations. Implemented in firmware are the below features:
 Flash file system management
 Bad-block management
 Wear-leveling
 Performance optimization
3.2.1 Bad Block Management
Inherent to NAND flash technology are areas (blocks) on the media that cannot be used for storage
because of their high error rate. These so-called “bad blocks” are already identified by the flash vendor
during manufacturing, but can also be accumulated over time during device operation.
The U2 controller contains a table that lists all the bad blocks on the device (Bad Block Table), and
automatically maps out these blocks upon system initialization. During device operation it ensures that
newly accumulated bad blocks are also mapped out and added to the Bad Block Table.
Bad block management is 100% transparent to the host application, which will not be aware of the location
or existence of bad blocks on the media.
61000-05387-114, January 2010
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