SDI Technologies SDIO Card manual Iosendopcond Command CMD5, VDD Voltage Window Position, OCR bit

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©Copyright 2000-2007 SD Card Association

SDIO Simplified Specification Version 2.00

3.2The IO_SEND_OP_COND Command (CMD5)

Figure 3-4 shows the format of the IO_SEND_OP_COND command (CMD5). The function of CMD5 for SDIO cards is similar to the operation of ACMD41 for SD memory cards. It is used to inquire about the voltage range needed by the I/O card. The normal response to CMD5 is R4 in either SD or SPI format. The R4 response in SD mode is shown in Figure 3-5 and the SPI version is shown in Figure 3-6.

S

D

Command Index

000101b

Stuff Bits

I/O OCR

CRC7

E

1

1

6

8

24

7

1

 

 

 

Figure 3-4 IO_SEND_OP_COND Command (CMD5)

 

 

The IO_SEND_OP_COND Command contains the following fields:

S(tart bit):

Start bit. Always 0

 

 

D(irection):

Direction. Always1 indicates transfer from host to card.

Command Index:

Identifies the CMD5 command with a value of 000101b

Stuff Bits:

Not used, shall be set to 0.

I/O OCR:

Operation Conditions Register. The supported minimum and maximum values

 

for VDD. The layout of the OCR is shown in Table 3-1. See section 4.10.1 for

 

additional information.

 

 

CRC7:

7 bits of CRC data

 

 

E(nd bit):

End bit, always 1

 

 

 

 

 

 

 

 

 

I/O OCR bit

VDD Voltage Window

 

 

 

position

(in Volts)

 

 

 

0-3

Reserved

 

 

 

4

Reserved

 

 

 

5

Reserved

 

 

 

6

Reserved

 

 

 

7

Reserved

 

 

 

8

2.0-2.1

 

 

 

9

2.1-2.2

 

 

 

10

2.2-2.3

 

 

 

11

2.3-2.4

 

 

 

12

2.4-2.5

 

 

 

13

2.5-2.6

 

 

 

14

2.6-2.7

 

 

 

15

2.7-2.8

 

 

 

16

2.8-2.9

 

 

 

17

2.9-3.0

 

 

 

18

3.0-3.1

 

 

 

19

3.1-3.2

 

 

 

20

3.2-3.3

 

 

 

21

3.3-3.4

 

 

 

22

3.4-3.5

 

 

 

23

3.5-3.6

 

Table 3-1 OCR Values for CMD5

The SDIO Version 2.00 cards shall support the operational voltage range 2.7-3.6V and are not necessary to support the voltage range 2.0-2.7V for basic communication. The hosts, which support SDIO Version 2.00, shall not use voltage range 2.0-2.7V for basic communication.

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Contents SD Specifications Part E1 Sdio Simplified Specification Changes compared to previous issue Sdio Simplified Specification VersionDate Version Release of SD Simplified Specification Conventions Used in This Document Table of Contents SPI and SD 1-bit Mode Interrupts 16.2 Table of Tables Table of Figures Standard Sdio Functions Sdio FeaturesGeneral Description Primary Reference DocumentSdio Host Modes Sdio Signaling DefinitionSdio Card Types Sdio Card modesSignal connection to two 4-bit Sdio cards Signal PinsSdio Card Initialization ResetDifferences in I/O card Initialization Sdio Simplified Specification Version MEM=0 Card initialization flow in SD mode Sdio aware host Illegal Command F8=0 Card initialization flow in SPI mode Sdio aware host OCR bit Iosendopcond Command CMD5VDD Voltage Window Position OCR Values for CMD5Iosendopcond Response R4 Response R4 in SD modeRe-initialize both I/O and Memory Acceptable Commands after InitializationRecommendations for RCA after Reset Special Initialization considerations for Combo CardsRe-Initialization Flow for Memory controller Re-Initialization Flow for I/O ControllerEnabling CRC in SPI Combo Card Sdio Command List Differences with SD Memory SpecificationUnsupported SD Memory Commands Modified R6 Response Reset for SdioBus Width Card Detect Resistor States Card Detect ResistorTimings Combo Card 4-bit ControlRead Abort Data Transfer Block SizesData Transfer Abort Changes to SD Memory Fixed RegistersRCA Register OCR RegisterCID Register CSD RegisterClear Sdio Status Register StructureBit Identifier Type Value Description Iorwdirect Command CMD52 New I/O Read/Write Commands1 CMD52 Response SD modes ComcrcerrorIllegalcommand Iorwdirect Response R5TRN=Transfer DIS=DisabledIdentifier Type Value Description Clear Condition CMD=DAT lines freeCRC Iorwextended Command CMD53Iorw Extended command Op Code Definition OP code Command operation1 CMD53 Data Transfer Format Byte Count ValuesInterrupts Register Access TimeSdio Card Internal Operation OverviewSdio Fixed Internal Map Suspend/ResumeRead Wait CMD52 During Data TransferCard Common Control Registers Cccr Common I/O Area CIAIOE3 Card Common Control Registers CccrType CCCR/SDIOTo abort transfers to/from memory Scsi 4BLS Transaction of function 0 CIA Empc Cccr bit DefinitionsField Type Function Basic Registers FBRAddress Function Basic Information Registers FBRFBR bit and field definitions Sdio Simplified Specification Version Field TypeCard Information Structure CIS and reserved area of CIA Setting Block Size with CMD53Card Information Structure CIS Multiple Function Sdio CardsState Diagram for Bus State Machine Bus State DiagramEmbedded I/O Code Storage Area CSA CSA AccessCSA Data Format Interrupt Timing Sdio InterruptsInterrupt Clear Timing Terminated Data Transfer Interrupt CycleSdio Suspend/Resume Operation Sdio Read Wait Operation Master Power Control Power ControlPower Control Overview Power Control support for Sdio CardsReference Tuples by Master Power Control and Power Select Power Control Support for the Sdio HostPower Selection High-Power TuplesPower Control Operation Sdio High-Speed Mode High-Speed ModeSwitching Bus Speed Mode in a Combo Card Sdio Physical Properties Sdio PowerSdio Simplified Specification Version Inrush Current Limiting Byte Order Within Tuples CIS FormatsCIS Reference Document Basic Tuple Format and Tuple Chain StructureCode Name Description Tuple VersionSdio Card Metaformat Tuples Supported by Sdio CardsCistplfuncid Function Identification Tuple Cistplmanfid Manufacturer Identification String TupleSdio Specific Extensions Cistplmanfid Manufacturer Identification TupleTplfidfunction Tuple for Function 0 common Cistplfunce Function Extension TupleCistplfunce Tuple General Structure Cistplfunce Tuple for Function 0 commonTplfidfunction Tuple for Function Cistplfunce Tuple for FunctionByte Sdio Simplified Specification Version Bit Name Tplfidfunction Field Descriptions for Functions10 Tplfefunctioninfo Definition 11 Tplfecsaproperty Definition13 Cistplsdioext Tuple Reserved for Sdio Cards Cistplsdiostd Function is a Standard Sdio Function12 Cistplsdiostd Tuple Reserved for Sdio Cards Cistplsdioext Tuple Reserved for Sdio CardsTable A-14 SD Mode Command List SD and SPI Command ListNormative Sdmem Sdio Table A-15 SPI Mode Command ListNormative References Appendix BAbbreviations and Terms Appendix CLOW, High Informative
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