Microsd Card Protocol Description; General Description; Sd Bus Protocol; Functional Description - SanDisk 2GB - 2GB Micro Secure Digital Card Product Manual

SanDisk microSD™, microSDHC™ and microSDXC™ cards
Table 10: Minimum User Area DOS Image Parameters
1
Capacity Total LBAs
64 GB 125,000,704
32GB 62,333,952
16 GB 31,116,288
8 GB 15,523,840
4 GB 7,744,512
2 GB 3,862,528
1 GB 1,930,240
1
1 (GB) = 1billion bytes. Some capacity not available for data storage.
2
Total LBAs, Number of Partition System Area Sectors, Total Partition Sectors, User Data Sectors and User Data
Bytes are minimum values. Actual values may vary depending on flash technology used.
4 SD C
MICRO

4.1 General Description

SD™ Protocol information for cards in the SanDisk microSD™ Card Product Family
is contained in this chapter; information includes SD bus protocol, card identification,
and a functional description.

4.2 SD Bus Protocol

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 3.01 for details.

4.3 Functional Description

In the SanDisk microSD Card Product Family, the host controls all communication
between itself and the cards. 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. For SD Card
commands, together with corresponding responses, state transitions, error conditions,
and timings refer to Section 4 of the SDA Physical Layer Specification, Version 3.01.
4.3.1

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 3.01.
4.3.2

Data Transfer Mode

Functionality of the Data Transfer Mode can be found in Section 4.3 of the SDA
Physical Layer Specification, Version 3.01. 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 microSD cards.
January 2012 Version 2.5 © 2008 - 2012 SanDisk Corporation. SanDisk Confidential, subject to all applicable non-disclosure agreements 17
2
No. of Partition System
2
Area Sectors
66304
16384
8192
8192
8192
505
505
P
ARD ROTOCOL
Total Partition User Data
2 2
Sectors Sectors
124,967,936
124,934,400
62,325,760
62,309,376
31,108,096
31,099,904
15,515,648
15,507,456
7,736,320
7,728,128
3,858,489
3,857,984
1,929,177
1,928,672
D
ESCRIPTION
OEM Product Manual
2.5
User Data
2
Bytes
63,864,569,856
31,902,400,512
15,923,150,848
7,939,817,472
3,956,801,536
1,975,287,808
987,480,064