Cmd0 to reset the memory section cmd52 to reset the

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CMD0 to reset the memory section CMD52 to reset the I/O section CMD0 in SD mode switches to SPI mode SD memory card uses ACMD6 to set bus width SD I/O card uses CMD52 to write to CCCR to set buswidth.
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SUSHMA RAWAL 20 SD Card Registers The OCR, CID, CSD and SCR registers carry the card/content specific information, while the RCA and DSR registers are configuration registers storing actual configuration parameters An SDIO only card eliminates some registers and changes some of the bits in the remaining registers.
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SUSHMA RAWAL 21 Card Detection SD memory and I/O cards use pull-up resistor for card detection. SD memory uses ACMD6 to control this resistor. SDIO uses CMD52 to write to CCCR to control this resistor. For combo card, resistor is enabled only if both the memory and I/O card enables it.
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SUSHMA RAWAL 22 SD memory and SD I/O combo card:DataTransfer Data transfer Size SDIO card: Either multibyteor block transfer SD Memory card: Only block transfer Data transfer abort CMD12 used to abort data transfer in a SD memory card. Use during infinite block transfer eg. Block count=0 SD I/O card write to Asxbits of CCCR to abort.
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SUSHMA RAWAL 23 SDIO Fixed Internal Map
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SUSHMA RAWAL 24 Common I/O Area The Common I/O Area (CIA) shall be implemented on all SDIO cards. The CIA is accessed by the host via I/O reads and writes to function 0. The registers within the CIA are provided to enable/disable the operation of the I/O function(s), control the generation of interrupts and optionally load software to support the I/O functions. The registers in the CIA also provide information about the function(s) abilities and requirements. There are three distinct register structures supported within the CIA. They are: 1. Card Common Control Registers (CCCR) 2. Function Basic Registers (FBR) 3. CardInformation Structure (CIS)
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SUSHMA RAWAL 25 Code Storage Area In order to support the concept of “Plug-and-Play”for SDIO cards, each function contained in a card may need to contain a block of memory for the storage of drivers and/or applications. In addition, since the same SDIO card may be used on multiple different host platforms, several different versions of the code may be needed for each function.
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