Sdio Card Initialization, Reset | SDI Technologies SDIO Card

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SDIO Simplified Specification Version 2.00

3.SDIO Card Initialization

3.1Differences in I/O card Initialization

A requirement for the SDIO specification is that an SDIO card shall not cause non-I/O aware hosts to fail when inserted. In order to prevent operation of I/O functions in non-I/O aware hosts, a change to the SD card identification mode flowchart is needed. A new command (IO_SEND_OP_COND, CMD5) is added to replace the ACMD41 for SDIO initialization by I/O aware hosts (see 3.2).

After reset or power-up, all I/O functions on the card are disabled and the I/O portion of the card shall not execute any operation except CMD5 or CMD0 with CS=low. If there is SD memory installed on the card (also called a combo card), that memory shall respond normally to all normal mandatory memory commands.

An I/O only card shall not respond to the ACMD41 and thus appear initially as an MMC card (See appendix B.1 for information on the MMC specification). The I/O only card shall also not respond to the CMD1 used to initialize the MMC cards and appear as a non-responsive card. The host then gives up and disables this card. Thus, the non-aware host receives no response from an I/O only card and force it to the inactive state. The operation of an I/O card with a non-I/O aware host is shown in Figure 3-1 Note that the solid lines are the actual paths taken while the dashed lines are not executed.

SPI Mode Idle

State

CMD58

(optional)

Busy

CMD0 + CS asserted (0)

Invalid

Cmd

Reset

SPI

Idle State

SD

No

ACMD41 Response (arg = 00)

Response

CMD0

CMD1 or		SDIO card is
ACMD41	Invalid	Rejected
	Invalid
	Cmd
		Inactive State
Normal SPI
memory operation

		Busy
		ACMD41	Response
	No	arg = working	Response
		arg = working
		voltage
	Response	voltage
	Response
		Response

CMD1

No

Response

	Normal SD	Card is MMC	SDIO card is
	memory operation		Rejected

Figure 3-1 SDIO response to non-I/O aware initialization

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SDI Technologies SDIO Card manual Sdio Card Initialization, Differences in I/O card Initialization, Reset

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 General Description Sdio FeaturesPrimary Reference Document Standard Sdio Functions Sdio Card Types Sdio Signaling DefinitionSdio Card modes Sdio Host 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 VDD Voltage Window Position Iosendopcond Command CMD5OCR Values for CMD5 OCR bit Iosendopcond Response R4 Response R4 in SD mode Recommendations for RCA after Reset Acceptable Commands after InitializationSpecial Initialization considerations for Combo Cards Re-initialize both I/O and Memory 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 Timings Card Detect ResistorCombo Card 4-bit Control Card Detect Resistor States Data Transfer Abort Data Transfer Block SizesChanges to SD Memory Fixed Registers Read Abort CID Register OCR RegisterCSD Register RCA Register Clear Sdio Status Register StructureBit Identifier Type Value Description Iorwdirect Command CMD52 New I/O Read/Write Commands Illegalcommand ComcrcerrorIorwdirect Response R5 1 CMD52 Response SD modes Identifier Type Value Description Clear Condition DIS=DisabledCMD=DAT lines free TRN=Transfer Iorw Extended command Op Code Definition Iorwextended Command CMD53OP code Command operation CRC 1 CMD53 Data Transfer Format Byte Count Values Sdio Card Internal Operation Register Access TimeOverview Interrupts Read Wait Suspend/ResumeCMD52 During Data Transfer Sdio Fixed Internal Map Card Common Control Registers Cccr Common I/O Area CIA Type Card Common Control Registers CccrCCCR/SDIO IOE3 To abort transfers to/from memory Scsi 4BLS Transaction of function 0 CIA Empc Cccr bit Definitions Address Function Basic Registers FBRFunction Basic Information Registers FBR Field Type FBR bit and field definitions Sdio Simplified Specification Version Field Type Card Information Structure CIS Setting Block Size with CMD53Multiple Function Sdio Cards Card Information Structure CIS and reserved area of CIA 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 Power Control Overview Power ControlPower Control support for Sdio Cards Master Power Control Power Selection Power Control Support for the Sdio HostHigh-Power Tuples Reference Tuples by Master Power Control and Power Select 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 CIS Reference Document CIS FormatsBasic Tuple Format and Tuple Chain Structure Byte Order Within Tuples Sdio Card Metaformat Tuple VersionTuples Supported by Sdio Cards Code Name Description Sdio Specific Extensions Cistplmanfid Manufacturer Identification String TupleCistplmanfid Manufacturer Identification Tuple Cistplfuncid Function Identification Tuple Cistplfunce Tuple General Structure Cistplfunce Function Extension TupleCistplfunce Tuple for Function 0 common Tplfidfunction Tuple for Function 0 common Tplfidfunction Tuple for Function Cistplfunce Tuple for FunctionByte Sdio Simplified Specification Version 10 Tplfefunctioninfo Definition Tplfidfunction Field Descriptions for Functions11 Tplfecsaproperty Definition Bit Name 12 Cistplsdiostd Tuple Reserved for Sdio Cards Cistplsdiostd Function is a Standard Sdio FunctionCistplsdioext Tuple Reserved for Sdio Cards 13 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