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SD Specifications
Part E1
SDIO Simplified Specification
Version 3.00
February 25, 2011
Technical Committee
SD Card Association
©Copyright 2000-2011 SD Card Association
SDIO Simplified Specification Version 3.00
i
Revision History
Date Version Changes compared to previous issue
April 3, 2006 1.10 The first release of the SDIO Simplified Specification
February 8, 2007 2.00 Followings functions are added in this version
(1) Added method to change bus speed (Normal Speed up to 25MHz and
High Speed up to 50 MHz)
(2) Operational Voltage Requirement is extended to 2.7-3.6V
(3) Combine sections 12 (Physical Properties) and 13 (Mechanical
Extensions) and add miniSDIO to the new section 13 (Physical
Properties)
(4) Add Embedded SDIO ATA Standard Function Interface Code
(5) Reference of Physical Ver2.00 supports SDHC combo card.
(6) Some typos in Ver1.10 are fixed.
February 25, 2011 3.00 Followings functions are added in this version
(1) Definition of Embedded SDIO
(2) Ultra High Speed Bus Speed Mode (UHS-I)
(3) Power Control Extension (Power State Control)
(4) Asynchronous Interrupt in 4-bit mode
(5) Shared Bus for supporting multiple devices
(6) Interface Signal of Embedded Device applicable to Shared Bus
Asynchronous Interrupt is not included in this document.
©Copyright 2000-2011 SD Card Association
SDIO Simplified Specification Version 3.00
ii
Release of SD Simplified Specification
The following conditions apply to the release of the SD simplified specification ("Simplified Specification")
by the SD Card Association. The Simplified Specification is a subset of the complete SD Specification
which is owned by the SD Card Association.
Publisher and Copyright Holder:
SD Card Association
2400 Camino Ramon, Suite 375
San Ramon, CA 94583 USA
Telephone: +1 (925) 275-6615,
Fax: +1 (925) 886-4870
E-mail: office@sdcard.org
Notes:
This Simplified Specification is provided on a non-confidential basis subject to the disclaimers below. Any
implementation of the Simplified Specification may require a license from the SD Card Association or
other third parties.
Disclaimers:
The information contained in the Simplified Specification is presented only as a standard specification for
SD Cards and SD Host/Ancillary products and is provided "AS-IS" without any representations or
warranties of any kind. No responsibility is assumed by the SD Card Association for any damages, any
infringements of patents or other right of the SD Card Association or any third parties, which may result
from its use. No license is granted by implication, estoppel or otherwise under any patent or other rights of
the SD Card Association or any third party. Nothing herein shall be construed as an obligation by the SD
Card Association to disclose or distribute any technical information, know-how or other confidential
information to any third party.
©Copyright 2000-2011 SD Card Association
SDIO Simplified Specification Version 3.00
iii
Conventions Used in This Document
Naming Conventions
• Some terms are capitalized to distinguish their definition from their common English meaning. Words
not capitalized have their common English meaning.
Numbers and Number Bases
• Hexadecimal numbers are written with a lower case "h" suffix, e.g., FFFFh and 80h.
• Binary numbers are written with a lower case "b" suffix (e.g., 10b).
• Binary numbers larger than four digits are written with a space dividing each group of four digits, as in
1000 0101 0010b.
• All other numbers are decimal.
Key Words
• May: Indicates flexibility of choice with no implied recommendation or requirement.
• Shall: Indicates a mandatory requirement. Designers shall implement such mandatory
requirements to ensure interchangeability and to claim conformance with the specification.
• Should: Indicates a strong recommendation but not a mandatory requirement. Designers should give
strong consideration to such recommendations, but there is still a choice in implementation.
Application Notes
Some sections of this document provide guidance to the host implementers as follows:
Application Note:
This is an example of an application note.
©Copyright 2000-2011 SD Card Association
SDIO Simplified Specification Version 3.00
iv
Table of Contents
1. General Description............................................................................................................1
1.1 Definitions......................................................................................................................................1
1.1.1 SDIO Card...............................................................................................................................1
1.1.2 Embedded SDIO.....................................................................................................................1
1.2 SDIO Features...............................................................................................................................1
1.2.1 Common SDIO Features.........................................................................................................1
1.2.2 SDIO Card Features ...............................................................................................................1
1.2.3 Embedded SDIO Device Features..........................................................................................2
1.3 Document Structure.......................................................................................................................3
1.4 Standard SDIO Functions..............................................................................................................3
2. SDIO Signaling Definition ..................................................................................................4
2.1 SDIO Card Types ..........................................................................................................................4
2.2 SDIO Card Modes .........................................................................................................................4
2.2.1 SPI (Card mandatory support) ................................................................................................4
2.2.2 1-bit SD Data Transfer Mode (Card Mandatory Support)........................................................4
2.2.3 4-bit SD Data Transfer Mode (Mandatory for High-Speed Cards, Optional for Low-Speed)...4
2.3 SDIO Host Modes..........................................................................................................................4
2.4 Signal Pins.....................................................................................................................................5
2.4.1 Signal Pins for SDIO Card ......................................................................................................5
3. SDIO Card Initialization ......................................................................................................6
3.1 Initialization Sequence...................................................................................................................6
3.1.1 Initialization by Non-I/O Aware Host........................................................................................6
3.1.2 Initialization by I/O Aware Host ...............................................................................................7
3.2 The IO_SEND_OP_COND Command (CMD5)...........................................................................13
3.3 The IO_SEND_OP_COND Response (R4).................................................................................14
3.4 Special Initialization Considerations for Combo Cards................................................................15
3.4.1 Re-initialize Both I/O and Memory ........................................................................................15
3.4.2 Using a Combo Card as SDIO only or SD Memory only after Combo Initialization ..............15
3.4.3 Acceptable Commands after Initialization .............................................................................15
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