Iosendopcond Command CMD5, OCR bit | SDI Technologies SDIO Card

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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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Image 19

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

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 Document Sdio Host Modes Sdio Signaling DefinitionSdio Card Types Sdio Card modes Signal connection to two 4-bit Sdio cards Signal Pins Sdio 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 CMD5 Iosendopcond Response R4 Response R4 in SD mode Re-initialize both I/O and Memory Acceptable Commands after InitializationRecommendations for RCA after Reset Special Initialization considerations for Combo Cards Re-Initialization Flow for Memory controller Re-Initialization Flow for I/O Controller Enabling 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 Control Read Abort Data Transfer Block SizesData Transfer Abort Changes to SD Memory Fixed Registers RCA Register OCR RegisterCID Register CSD Register Clear Sdio Status Register StructureBit Identifier Type Value Description Iorwdirect Command CMD52 New I/O Read/Write Commands 1 CMD52 Response SD modes ComcrcerrorIllegalcommand Iorwdirect Response R5 TRN=Transfer DIS=DisabledIdentifier Type Value Description Clear Condition CMD=DAT lines free CRC Iorwextended Command CMD53Iorw Extended command Op Code Definition OP code Command operation 1 CMD53 Data Transfer Format Byte Count Values Interrupts Register Access TimeSdio Card Internal Operation Overview Sdio Fixed Internal Map Suspend/ResumeRead Wait CMD52 During Data Transfer Card Common Control Registers Cccr Common I/O Area CIA IOE3 Card Common Control Registers CccrType CCCR/SDIO To abort transfers to/from memory Scsi 4BLS Transaction of function 0 CIA Empc Cccr bit Definitions Field Type Function Basic Registers FBRAddress Function Basic Information Registers FBR FBR bit and field definitions Sdio Simplified Specification Version Field Type Card Information Structure CIS and reserved area of CIA Setting Block Size with CMD53Card Information Structure CIS Multiple Function Sdio Cards State Diagram for Bus State Machine Bus State Diagram Embedded I/O Code Storage Area CSA CSA AccessCSA Data Format Interrupt Timing Sdio Interrupts Interrupt Clear Timing Terminated Data Transfer Interrupt Cycle Sdio Suspend/Resume Operation Sdio Read Wait Operation Master Power Control Power ControlPower Control Overview Power Control support for Sdio Cards Reference Tuples by Master Power Control and Power Select Power Control Support for the Sdio HostPower Selection High-Power Tuples Power Control Operation Sdio High-Speed Mode High-Speed ModeSwitching Bus Speed Mode in a Combo Card Sdio Physical Properties Sdio Power Sdio Simplified Specification Version Inrush Current Limiting Byte Order Within Tuples CIS FormatsCIS Reference Document Basic Tuple Format and Tuple Chain Structure Code Name Description Tuple VersionSdio Card Metaformat Tuples Supported by Sdio Cards Cistplfuncid Function Identification Tuple Cistplmanfid Manufacturer Identification String TupleSdio Specific Extensions Cistplmanfid Manufacturer Identification Tuple Tplfidfunction Tuple for Function 0 common Cistplfunce Function Extension TupleCistplfunce Tuple General Structure Cistplfunce Tuple for Function 0 common Tplfidfunction Tuple for Function Cistplfunce Tuple for FunctionByte Sdio Simplified Specification Version Bit Name Tplfidfunction Field Descriptions for Functions10 Tplfefunctioninfo Definition 11 Tplfecsaproperty Definition 13 Cistplsdioext Tuple Reserved for Sdio Cards Cistplsdiostd Function is a Standard Sdio Function12 Cistplsdiostd Tuple Reserved for Sdio Cards Cistplsdioext Tuple Reserved for Sdio Cards Table A-14 SD Mode Command List SD and SPI Command ListNormative Sdmem Sdio Table A-15 SPI Mode Command List Normative References Appendix B Abbreviations and Terms Appendix C LOW, High Informative