Introduction to the SD Card
SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION
1-3
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Comfortable erase mechanism.
The performance of the communication channel is described in Table 1-2.
Table 1-2. SD Bus/SPI Bus Comparison
SD Card Using SD Bus
SD Card Using SPI Bus
Six-wire communication channel (clock, command, 4
data lines).
Three-wire serial data bus (Clock, dataIn, dataOut) + card
specific CS signal (hardwired card selection).
Error-protected data transfer.
Optional non-protected data transfer mode available.
Single or multiple block oriented data transfer.
Single or multiple block oriented data transfer.
1.4. SD Card Standard
SanDisk SD Cards are fully compatible with the following
SD Card Physical Layer Specification
standard:
The SD Card Physical Layer System Specification, Version 1.01
This specification may be obtained from:
SD Card Association
53 Muckelemi St.
P.O. Box 189
San Juan Bautista, CA 95045-0189
USA
Phone: 831-623-2107
Fax: 831-623-2248
Email: [email protected]
http://www.sdcard.org
1.5. Functional Description
SanDisk SD Cards contain 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:
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Host independence from details of erasing and programming flash memory.
•
Sophisticated system for managing defects (analogous to systems found in magnetic disk drives).
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Sophisticated system for error recovery including a powerful error correction code (ECC).
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Power management for low power operation.
