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SQF-SMSM2-8G-S9E Datasheet(PDF) 8 Page - Advantech Co., Ltd. |
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SQF-SMSM2-8G-S9E Datasheet(HTML) 8 Page - Advantech Co., Ltd. |
8 / 25 page SQFlash mSATA 630 Specifications subject to change without notice, contact your sales representatives for the most update information. REV 0.5 Page 8 of 25 Jun. 8, 2015 4. General Description Advanced NAND Flash Controller Advantech SQFlash 630 series mSATA includes Bad Block Management Algorithm, Wear Leveling Algorithm, Error Detection / Correction Code (EDC/ECC) Algorithm, Fragment Writing Technology, and GuaranteedFlush Technology. Bad Block Management Bad blocks are blocks that contain one or more invalid bits of which the reliability is not guaranteed. Bad blocks may be representing when flash is shipped and may developed during life time of the device. Advantech SQFlash 630 series mSATA implement an efficient bad block management algorithm to detect the factory produced bad blocks and manages any bad blocks that may develop over the life time of the device. This process is completely transparent to the user, user will not aware of the existence of the bad blocks during operation. Wear Leveling NAND Type flash have individually erasable blocks, each of which can be put through a finite number of erase cycles before becoming unreliable. It means after certain cycles for any given block, errors can be occurred in a much higher rate compared with typical situation. Unfortunately, in the most of cases, the flash media will not been used evenly. For certain area, like file system, the data gets updated much frequently than other area. Flash media will rapidly wear out in place without any rotation. Wear leveling attempts to work around these limitations by arranging data so that erasures and re-writes are distributed evenly across the full medium. In this way, no single sector prematurely fails due to a high concentration of program/erase cycles. Advantech SQFlash 630 series mSATA provides advanced wear leveling algorithm, which can efficiently spread out the flash usage through the whole flash media area. By implement both dynamic and static wear leveling algorithms, the life expectancy of the flash media can be improved significantly. Error Detection / Correction Advantech SQFlash 630 series mSATA utilizes BCH ECC Algorithm which offers one of the most powerful ECC algorithms in the industry. This algorithm can support 72 bit ECC correct per 1K Byte data. Hardware Write Protect Pin A 2-pin header is mounted and connected to controller reserved GPIO for the drive write protection. When the pins are opened, all of the write command will be carried to a buffer area without real programming to the Flash IC. So the data won ’t be saved in this mode and will be totally discarded upon power shutting down. Sophisticate Product Management Systems Since industrial application require much more reliable devices compare with consumer product, a more sophisticated product management system become necessary for industrial customer requirement. The key to providing reliable devices is product traceability and failure analysis system. By implement such systems end customer can expect much more reliable product. |
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