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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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SDSDM-256 Datenblatt(PDF) 9 Page - List of Unclassifed Manufacturers |
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SDSDM-256 Datenblatt(HTML) 9 Page - List of Unclassifed Manufacturers |
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9 / 40 page  © 2007 SanDisk Corporation 1-3 Rev. 2.2, 06/07 SanDisk SD Card Product Family Product Manual Introduction Functional Description The family of SanDisk SD cards contains a high-level, intelligent subsystem as shown in Figure 1-1. This intelligent (microprocessor) subsystem provides many capabilities not found in other types of memory cards. These capabilities include: • Host independence from details of erasing and programming flash memory • Sophisticated system for managing defects (analogous to systems found in magnetic disk drives) • Sophisticated system for error recovery including a powerful ECC • Power management for low power operation Technology Independence The 512-byte sector size of a card in the SanDisk SD Card Product Family is the same as that in an IDE magnetic disk drive. To write or read a sector (or multiple sectors), the host software simply issues a read or write command to the card. The command contains the address and number of sectors to write or read. The host software then waits for the command to complete. The host software does not get involved in the details of how the flash memory is erased, programmed or read. This is extremely important because flash devices are expected to get increasingly complex in the future. Because cards in the SanDisk SD Card Product Family use an intelligent on-board controller, host system software will not need to be updated as new flash memory evolves. In other words, systems that support the SD Card Product Family today will be able to access future SanDisk cards built with new flash technology without having to update or change host software. Defect and Error Management The SanDisk SD Card Product Family contains a sophisticated defect and error management system. This system is analogous to the systems found in magnetic disk drives and in many cases offers enhancements. If necessary, SanDisk SD Card Product Family will rewrite data from a defective sector to a good sector. This is completely transparent to the host and does not consume any user data space. The SanDisk SD Card Product Family soft error rate specification is much better than the magnetic disk drive specification. In the extremely rare case that a read error does occur, SanDisk SD Card Product Family has innovative algorithms to recover the data. These defect and error management systems, coupled with the solid state construction, give SanDisk SD Card Product Family unparalleled reliability. Content Protection A detailed description of the content protection mechanism and related security SD commands can be found in the SD Security Specification from the SDA. All SD security-related commands in the SanDisk SD Card Product Family operate in the data transfer mode. An authentication procedure is done between a card and the connected device, either the LCM (PC for example) or the PD (portable device, such as SD player). After the authentication process passes, the card is ready to accept or give data from/to the connected device. While the card is in the secured mode of operation (after the authentication succeeded) the argument and the associated data that is sent to the card or read from the card are encrypted. At the end of read, write or erase operations, a card automatically gets out of its secured mode. |
Ähnliche Teilenummer - SDSDM-256 |
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Ähnliche Beschreibung - SDSDM-256 |
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