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SD Specifications

Part E1

SDIO Specification

Version 2.00

January 30, 2007

Technical Committee

SD Card Association

SDIO Specification Version 2.00

i Confidential

Revision History

Date Version Changes compared to previous issue

October, 2001 1.00 Base version initial release

August 18, 2004 1.10 (1) Voltage Range is now either Standard (2.7-3.6V) or Minimal

(3.1-3.5V)

(2) Added High-Power support for cards requiring more than 200mA.

(3) Added support for greater than 15 standard SDIO standard

functions

(4) Defined inrush current limits

(5) Changed method to disable card detect resistor in combo cards

(6) Removed Inhibited Interrupt Section

(7) Added requirement to support CMD52 during Data Transfer

(8) Added Small Form-Factor SDIO physical description

(9) Update tuples to implement the changes noted above

(10) Changed R5 ERROR type from E R X to E R

(11) Fix typos and add clarifications

January 30, 2007 2.00 (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.

To the extent this proposed specification, which is being submitted for review under the IP

Policy, implements, incorporates by reference or refers to any portion of versions 1.0 or 1.01 of

the SD Specifications (including Parts 1 through 4), adoption of the proposed specification

shall require Members utilizing the adopted specification to obtain the appropriate licenses

from the SD-3C, LLC, as required for the utilization of those portion(s) of versions 1.0 or 1.01 of

the SD Specifications.

For example, implementation of the SD Specifications in a host device under versions 1.0 or

1.01 and under the adopted specification requires the execution of a SD Host Ancillary

License Agreement with the SD-3C, LLC; and implementation of the SD Specifications under

versions 1.0 or 1.01 and under the proposed specification in a SD Card containing any

memory storage capability (other than for storage of executable code for a controller or

microprocessor within the SD Card) requires the execution of a SD Memory Card License

Agreement with the SD-3C, LLC.

SDIO Specification Version 2.00

ii Confidential

Conditions for publication

Publisher and Copyright Holder:

SD 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

Confidentiality:

The contents of this document are deemed confidential information of the SD-3C LLC and/or the SD Card

Association (the "Disclosers"). As such, the contents and your right to use the contents are subject to the

confidentiality obligations stated in the written agreement you entered into with the Disclosers which entitled

you to receive this document, such as a Non-Disclosure Agreement, the License Agreement for SDA

Memory Card Specifications (also known as "LAMS"), the SD Host/Ancillary Product License Agreement

(also known as "HALA") or the IP Policy.

Disclaimers:

The information contained herein is presented only as a standard specification for SD Card and SD

Host/Ancillary products. No responsibility is assumed by SD Card Association for any damages, any

infringements of patents or other right of the third parties, which may result from its use. No license is granted

by implication or otherwise under any patent or rights of SD Card Association or others.

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.

SDIO Specification Version 2.00

iii Confidential

Table of Contents

1. General Description ................................................................................................................................. 1

1.1 SDIO Features .................................................................................................................................... 1

1.2 Primary Reference Document ............................................................................................................. 1

1.3 Standard SDIO Functions.................................................................................................................... 1

2. SDIO Signaling Definition........................................................................................................................ 2

2.1 SDIO Card Types ................................................................................................................................ 2

2.2 SDIO Card modes............................................................................................................................... 2

2.2.1 SPI (Card mandatory support) ..................................................................................................... 2

2.2.2 1-bit SD Data Transfer Mode (Card Mandatory Support) ............................................................. 2

2.2.3 4-bit SD Data Transfer Mode (Mandatory for High-Speed Cards, Optional for Low-Speed)......... 2

2.3 SDIO Host Modes ............................................................................................................................... 2

2.4 Signal Pins .......................................................................................................................................... 3

2.5 Host Requirements for SDIO............................................................................................................... 3

3. SDIO Card Initialization............................................................................................................................ 5

3.1 Differences in I/O card Initialization ..................................................................................................... 5

3.2

The IO_SEND_OP_COND Command (CMD5)..................................................................................11

3.3 The IO_SEND_OP_COND Response (R4)....................................................................................... 12

3.4 Special Initialization considerations for Combo Cards....................................................................... 13

3.4.1 Re-initialize both I/O and Memory .............................................................................................. 13

3.4.2 Using a Combo Card as SDIO only or SD Memory only after Combo Initialization.................... 13

3.4.3 Acceptable Commands after Initialization .................................................................................. 13

3.4.4 Recommendations for RCA after Reset ..................................................................................... 13

3.4.5 Enabling CRC in SPI Combo Card............................................................................................. 15

4. Differences with SD Memory Specification.......................................................................................... 16

4.1 SDIO Command List ......................................................................................................................... 16

4.2 Unsupported SD Memory Commands............................................................................................... 16

4.3 Modified R6 Response ...................................................................................................................... 17

4.4 Reset for SDIO.................................................................................................................................. 17

4.5 Bus Width.......................................................................................................................................... 17

4.6 Card Detect Resistor......................................................................................................................... 18

4.7 Timings.............................................................................................................................................. 18

4.8

Data Transfer Block Sizes ................................................................................................................. 19

4.9 Data Transfer Abort ........................................................................................................................... 19

4.9.1 Read Abort ................................................................................................................................. 19

4.9.2 Write Abort ................................................................................................................................. 20

4.10 Changes to SD Memory Fixed Registers .......................................................................................... 21

4.10.1 OCR Register............................................................................................................................. 21

4.10.2 CID Register............................................................................................................................... 21

4.10.3 CSD Register ............................................................................................................................. 21

4.10.4 RCA Register ............................................................................................................................. 21

4.10.5 DSR Register ............................................................................................................................. 21

4.10.6 SCR Register ............................................................................................................................. 21

4.10.7 SD Status ................................................................................................................................... 22

4.10.8 Card Status Register .................................................................................................................. 22

5. New I/O Read/Write Commands............................................................................................................ 24

5.1 IO_RW_DIRECT Command (CMD52) .............................................................................................. 24

5.2 IO_RW_DIRECT Response (R5) ......................................................................................................25

5.2.1

CMD52 Response (SD modes).................................................................................................. 25

5.2.2 R5, IO_RW_DIRECT Response (SPI mode) ............................................................................. 26

5.3 IO_RW_EXTENDED Command (CMD53) ........................................................................................ 27

5.3.1 CMD53 Data Transfer Format .................................................................................................... 28

SDIO Specification Version 2.00

iv Confidential

5.3.2 Special Timing for CMD53 Multi-Block Read.............................................................................. 29

6. SDIO Card Internal Operation................................................................................................................ 30

6.1 Overview ........................................................................................................................................... 30

6.2 Register Access Time........................................................................................................................ 30

6.3 Interrupts ........................................................................................................................................... 30

6.4 Suspend/Resume.............................................................................................................................. 31

6.5 Read Wait.......................................................................................................................................... 31

6.6 CMD52 During Data Transfer............................................................................................................ 31

6.7 SDIO Fixed Internal Map................................................................................................................... 31

6.8 Common I/O Area (CIA) .................................................................................................................... 32

6.9 Card Common Control Registers (CCCR)......................................................................................... 32

6.10 Function Basic Registers (FBR) ........................................................................................................ 39

6.11 Card Information Structure (CIS)....................................................................................................... 41

6.12 Multiple Function SDIO Cards........................................................................................................... 41

6.13 Setting Block Size with CMD53......................................................................................................... 41

6.14 Bus State Diagram ............................................................................................................................ 42

7. Embedded I/O Code Storage Area (CSA) ............................................................................................. 43

7.1 CSA Licensing Notice........................................................................................................................ 43

7.2 CSA Access....................................................................................................................................... 43

7.3 CSA Data Format .............................................................................................................................. 43

8. SDIO Interrupts....................................................................................................................................... 44

8.1 Interrupt Timing ................................................................................................................................. 44

8.1.1 SPI and SD 1-bit Mode Interrupts .............................................................................................. 44

8.1.2 SD 4-bit Mode ............................................................................................................................ 44

8.1.3 Interrupt Period Definition .......................................................................................................... 44

8.1.4 Interrupt Period at the Data Block Gap in 4-bit SD Mode (Optional) .......................................... 46

8.1.5 Inhibited Interrupts (Removed Section)...................................................................................... 48

8.1.6 End of Interrupt Cycles............................................................................................................... 48

8.1.7 Terminated Data Transfer Interrupt Cycle .................................................................................. 49

8.1.8 Interrupt Clear Timing................................................................................................................. 50

9. SDIO Suspend/Resume Operation........................................................................................................ 51

10. SDIO Read Wait Operation.......................................................................................................

.............. 55

11. Power Control......................................................................................................................................... 57

11.1 Power Control Overview.................................................................................................................... 57

11.2 Power Control support for SDIO Cards ............................................................................................. 57

11.2.1 Master Power Control ................................................................................................................ 57

11.2.2 Power Selection ......................................................................................................................... 58

11.2.3 High-Power Tuples..................................................................................................................... 58

11.3 Power Control Support for the SDIO Host.........................................................................................58

11.3.1 Version 1.10 Host....................................................................................................................... 58

11.3.2 Power Control Operation............................................................................................................ 59

12. High-Speed Mode ................................................................................................................................... 60

12.1 SDIO High-Speed Mode.................................................................................................................... 60

12.2 Switching Bus Speed Mode in a Combo Card................................................................................... 60

13. SDIO Physical Properties ...................................................................................................................... 62

13.1 SDIO Form Factors ........................................................................................................................... 62

13.2 Full-Size SDIO .................................................................................................................................. 62

13.2.1 Full-Size SDIO Mechanical Extensions...................................................................................... 62

13.2.2 Additional ESD/EMI Ground Point.............................................................................................. 63

13.2.3 Full-Size SDIO Extended Case.................................................................................................. 63

13.2.4 Write Protect Switch................................................................................................................... 63

13.3 miniSDIO........................................................................................................................................... 65

13.3.1 miniSDIO Mechanical Extensions .............................................................................................. 65

13.3.2 Additional ESD/EMI Ground Point.............................................................................................. 65

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