SDI Technologies SDIO Card manual Byte Count Values, 1 CMD53 Data Transfer Format

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©Copyright 2000-2007 SD Card Association

SDIO Simplified Specification Version 2.00

address that increment by 1 after each operation. This command is used when large amounts of I/O data exist within the I/O card in a RAM like data buffer. In this operation, the start address is loaded into the Register Address field. The first operation occurs at that address within the I/O card. The next operation shall occur at address+1 with the address incrementing by 1 until the operation has completed. As with OP Code 0, the number of bytes is set in the Byte Count field of the command.

Register Address:

Start Address of I/O register to read or write. Range is [0x1FFFF:0]

Byte/Block Count

If the command is operating on bytes (Block Mode = 0), this field contains the

 

number of bytes to read or write. A value of 0x000 shall cause 512 bytes to be read

 

or written.

 

 

 

 

 

 

 

 

 

 

 

 

 

Count Value

0x000

0x001

0x002 ----

0x1FF

 

 

Bytes Transferred

512

1

2

511

 

 

Block Transferred

∞

1

2

511

 

 

Table 5-3 Byte Count Values

 

 

 

If the command is in block mode (Block Mode=1), the Block Count field specifies the

 

number of Data Blocks to be transferred following this command. A value of 0x000

 

indicates that the count set to infinite. In this case, the I/O blocks shall be transferred

 

until the operation is aborted by writing to the I/O abort function select bits (ASx) in

 

the CCCR (see Table 6-1 and Table 6-2). Table 5-3 shows the relationship between

 

the value in the command and the actual number of bytes transferred.

CRC7:

7 bits of CRC data

 

 

 

 

E(nd bit):

End bit, always 1

 

 

 

 

 

The response from the SDIO card to CMD53 shall be R5 (the same as CMD52) as defined in 5.2. For CMD53, the 8-bit data field shall be stuff bits and shall be read as 0x00. Also, the ERROR response bit shall be type “E R X” (see Table 5-1).

5.3.1CMD53 Data Transfer Format

When executing the IO_RW_EXTENDED (CMD53), the multi-byte or multi-block data transfer is similar to the data transfer for memory. For the multi-byte transfer modes (block mode=0) the following applies:

IO_RW_EXTENDED byte read is similar to CMD17 (READ_SINGLE_BLOCK)

IO_RW_EXTENDED byte write is similar to CMD24 (WRITE_BLOCK)

Note that the byte count for this transfer is set in the command, rather than the fixed block size. Thus, the size of the data payload is in the range of 1-512 bytes. The block mode is similar to the following memory commands:

IO_RW_EXTENDED block read is similar to CMD18 (READ_MULTIPLE_BLOCK)

IO_RW_EXTENDED block write is similar to CMD25 (WRITE_MULTIPLE_BLOCK)

For the block mode the only difference is that for a fixed block count, the host does not need to stop the transfer, as it continues until the block count is satisfied. If the block count is set to zero, the operation is identical to the memory mode in that the host must stop the transfer.

5.3.2Special Timing for CMD53 Multi-Block Read This section is not included in the Simplified Specification.

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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 Primary Reference Document Sdio FeaturesGeneral Description Standard Sdio FunctionsSdio Card modes Sdio Signaling DefinitionSdio Card Types Sdio Host ModesSignal Pins Signal connection to two 4-bit Sdio cardsSdio 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 Values for CMD5 Iosendopcond Command CMD5VDD Voltage Window Position OCR bitResponse R4 in SD mode Iosendopcond Response R4Special Initialization considerations for Combo Cards Acceptable Commands after InitializationRecommendations for RCA after Reset Re-initialize both I/O and MemoryRe-Initialization Flow for I/O Controller Re-Initialization Flow for Memory controllerEnabling CRC in SPI Combo Card Sdio Command List Differences with SD Memory SpecificationUnsupported SD Memory Commands Modified R6 Response Reset for SdioBus Width Combo Card 4-bit Control Card Detect ResistorTimings Card Detect Resistor StatesChanges to SD Memory Fixed Registers Data Transfer Block SizesData Transfer Abort Read AbortCSD Register OCR RegisterCID Register RCA RegisterClear Sdio Status Register StructureBit Identifier Type Value Description New I/O Read/Write Commands Iorwdirect Command CMD52Iorwdirect Response R5 ComcrcerrorIllegalcommand 1 CMD52 Response SD modesCMD=DAT lines free DIS=DisabledIdentifier Type Value Description Clear Condition TRN=TransferOP code Command operation Iorwextended Command CMD53Iorw Extended command Op Code Definition CRCByte Count Values 1 CMD53 Data Transfer FormatOverview Register Access TimeSdio Card Internal Operation InterruptsCMD52 During Data Transfer Suspend/ResumeRead Wait Sdio Fixed Internal MapCommon I/O Area CIA Card Common Control Registers CccrCCCR/SDIO Card Common Control Registers CccrType IOE3To abort transfers to/from memory Scsi 4BLS Transaction of function 0 CIA Cccr bit Definitions EmpcFunction Basic Information Registers FBR Function Basic Registers FBRAddress Field TypeSdio Simplified Specification Version Field Type FBR bit and field definitionsMultiple Function Sdio Cards Setting Block Size with CMD53Card Information Structure CIS Card Information Structure CIS and reserved area of CIABus State Diagram State Diagram for Bus State MachineEmbedded I/O Code Storage Area CSA CSA AccessCSA Data Format Sdio Interrupts Interrupt TimingTerminated Data Transfer Interrupt Cycle Interrupt Clear TimingSdio Suspend/Resume Operation Sdio Read Wait Operation Power Control support for Sdio Cards Power ControlPower Control Overview Master Power ControlHigh-Power Tuples Power Control Support for the Sdio HostPower Selection Reference Tuples by Master Power Control and Power SelectPower Control Operation Sdio High-Speed Mode High-Speed ModeSwitching Bus Speed Mode in a Combo Card Sdio Power Sdio Physical PropertiesSdio Simplified Specification Version Inrush Current Limiting Basic Tuple Format and Tuple Chain Structure CIS FormatsCIS Reference Document Byte Order Within TuplesTuples Supported by Sdio Cards Tuple VersionSdio Card Metaformat Code Name DescriptionCistplmanfid Manufacturer Identification Tuple Cistplmanfid Manufacturer Identification String TupleSdio Specific Extensions Cistplfuncid Function Identification TupleCistplfunce Tuple for Function 0 common Cistplfunce Function Extension TupleCistplfunce Tuple General Structure Tplfidfunction Tuple for Function 0 commonTplfidfunction Tuple for Function Cistplfunce Tuple for FunctionByte Sdio Simplified Specification Version 11 Tplfecsaproperty Definition Tplfidfunction Field Descriptions for Functions10 Tplfefunctioninfo Definition Bit NameCistplsdioext Tuple Reserved for Sdio Cards Cistplsdiostd Function is a Standard Sdio Function12 Cistplsdiostd Tuple Reserved for Sdio Cards 13 Cistplsdioext Tuple Reserved for Sdio CardsTable A-14 SD Mode Command List SD and SPI Command ListNormative Table A-15 SPI Mode Command List Sdmem SdioAppendix B Normative ReferencesAppendix C Abbreviations and TermsLOW, High Informative
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