SanDisk microSD™, microSDHC™ and microSDXC™ cards
OEM Product Manual
2.5
January 2012 Version 2.5 © 2008 - 2012 SanDisk Corporation. SanDisk Confidential, subject to all applicable non-disclosure agreements
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4.3.3
Clock Control
The host can use the bus clock signal in SanDisk microSD 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 3.01.
Cyclic Redundancy Codes
The Cyclic Redundancy Check (CRC) protects against transmission errors that may
occur on the bus in SanDisk microSD Card Product Family cards. Detailed
information and examples for CRC7 and CRC16 are provided in Section 4.5 of the
SDA Physical Layer Specification, Version 3.01.
4.3.4
Error Conditions
See Section 4.6 of the SDA Physical Layer Specification, Version 3.01.
4.3.5
Commands
See Section 4.7 of the SDA Physical Layer Specification, Version 3.01 for detailed
information about card commands in the SanDisk microSD Card Product Family.
4.3.6
Card State Transition
In microSD cards, the state transition is dependent on the received command. The
transition is defined in Section 4.8 of the SDA Physical Layer Specification, Version
3.01 along with responses sent on the command line.
4.3.7
Timing Diagrams and Values
See Section 4.12 of the SDA Physical Layer Specification, Version 3.01.
4.3.8
Speed Class Specification
SDA speed class specification classifies card minimum write performance by speed
class number and offers the method to test performance. For more information, refer
to Section 4.13 of the SDA Physical Layer Specification, Version 3.01.
4.3.9
Erase Timeout Calculation
See Section 4.14 of the SDA Physical Layer Specification, Version 3.01.
