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SDSDAB-002G Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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SDSDAB-002G Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 22 page SanDisk SD Card - OEM Product Manual Introduction 11/2010, Version 2.9. © 2007 - 2010 SanDisk Corporation. SanDisk Confidential, subject to all applicable non-disclosure agreements 4 4 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 SanDisk SD cards 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 today will be able to access future SanDisk cards built with new flash technology without having to update or change host software. 1.5.2 Defect and Error Management The SanDisk SD Card 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 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 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 has innovative algorithms to recover the data. These defect and error management systems, coupled with the solid state construction, give SanDisk SD Card unparalleled reliability. 1.5.3 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 operate in the data transfer mode. 1.5.4 Wear Leveling Wear leveling is an intrinsic part of the erase pooling functionality of SanDisk SD cards. 1.5.5 Automatic Sleep Mode A unique feature of SanDisk SD Cards is automatic entrance and exit from sleep mode. Upon completion of an operation, cards enter sleep mode to conserve power if no further commands are received. The host does not have to take any action for this to occur. When the host is ready to access a card in sleep mode, any command issued to it will cause it to exit sleep, and respond. 1.5.6 Hot Insertion Support for hot insertion will be required on the host but will be supported through the connector. Connector manufacturers will provide connectors that have power pins long enough to be powered before contact is made with the other pins. This approach is similar to that used in PCMCIA devices to allow for hot insertion. 1.6 SD Card Products in SD Bus Mode The following sections provide valuable information on SanDisk SD Cards in SD Bus mode. SanDisk SD Cards are fully compliant with the SDA Physical Layer Specification, Version 3.01. Card Specific Data (CSD) Register structures are compliant with CSD Structure 1.0 and 2.0. This section covers Negotiating Operating Conditions, Card Acquisition and Identification, Card Status, Memory Array Partitioning, Read/Write Operations, Data Transfer Rate, Data Protection in Flash Cards, Write Protection, Copy Bit, and CSD Register. Additional practical card detection methods can be found in application notes pertaining to the SDA Physical Layer Specification, Version 3.01. |
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