SDSDJ-512 SanDisk, SDSDJ-512 Datasheet - Page 33

• Manufacturer Part Number: SDSDJ-512
• Description: MEMORY CARD SD 512MB
• Manufacturer: SanDisk

Specifications of SDSDJ-512

• Memory Size: 512MB
• Memory Type: Memory Card - Standard SD™
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

© 2007 SanDisk Corporation
CHAPTER 4
General Description
SD Bus Protocol
Functional Description
SD Protocol information for cards in the SanDisk SD Card Product Family is contained in this
chapter; information includes SD bus protocol, card identification, and a functional description.
Communication over the SD bus is based on command and data-bit streams initiated by a start
bit and terminated by a stop bit. See Section 3.6.1 of the SDA Physical Layer Specification,
Version 2.00 for details.
In the SanDisk SD Card Product Family, the host controls all communication between itself
and the cards. To demonstrate how this communication works, this section provides a general
overview of the card identification and data transfer modes; commands; card dependencies;
various card operation modes and restrictions for controlling the clock signal. All SD Card
commands, together with corresponding responses, state transitions, error conditions, and
timings are also provided. For detailed information, refer to Section 4 of the SDA Physical
Layer Specification, Version 2.00.
Card Identification Mode
In Card Identification Mode, the host resets all cards, validates operation voltage range,
identifies and requests cards to publish a relative card address. For more information see
Section 4.2 in the SDA Physical Layer Specification, Version 2.00.
Data Transfer Mode
In Data Transfer Mode, the host may operate SanDisk SD Card Product Family cards in the f
frequency range. In the SDA Physical Specification, this section includes information about
data read and write, erase, write-protect management, card lock/unlock operations, application-
specific commands, switch function command, high-speed mode, command system, and the
Send Interface Condition command (CMD8). CMD8 is part of identification mode and
command functional differences in high capacity SD cards. For more detailed information,
refer to Section 4.3 of the SDA Physical Layer Specification, Version 2.00.
Clock Control
The host can use the bus clock signal in SanDisk SD cards to switch them to energy saving
mode or to control data flow on the bus. See Section 4.4 of the SDA Physical Layer
Specification, Version 2.00.
Cyclic Redundancy Codes
The Cyclic Redundancy Check (CRC) protects against transmission errors that may occur on
the bus in SanDisk SD Card Product Family cards. Detailed information and examples for
SD Card Protocol Description
4-1
Rev. 2.2, 06/07
PP