Datasheet

SLUFDxxxU2TU(I) Data Sheet STEC™ Industrial Grade USB Flash Drive
61000-07007-107, September 2012 6
3.0 Theory of Operation
3.1 Block Diagram
The industrial grade USB flash drive uses STEC‟s proprietary USB flash memory controller, and is
combined with SLC NAND flash for optimal device reliability. The controller‟s firmware supports the latest
NAND flash technology from multiple vendors, and is optimized for the highest performance and reliability.
The controller consists of the functional blocks as shown in Figure 3. The blocks are described in the
paragraphs following the figure.
Figure 3: Controller block diagram
3.1.1 Controller Embedded Components
 Microcontroller, the hardware backbone for the USB flash memory controller algorithm.
 USB 2.0 Interface Controller with high speed (480 Mbps) device function. This block interfaces
with the host system via the USB interface.
 Flash Interface Controller that serves as the interface to the NAND flash components. It supports
all the major NAND flash memory manufacturers.
 Flash Storage Management Algorithm Block is responsible for the flash management, including
wear leveling, bad block management, and Error Correction.
 ECC block is responsible for on-the-fly error and correction.
 Sector Buffer for optimized performance.
 SRAM for running controller firmware fast and efficient.
 ROM for storing controllers boot code.