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Secure digital input/output interface (SDIO)
RM0008
By using these commands without including the voltage range as the operand, the SDIO
card host can query each card and determine the common voltage range before placing out-
of-range cards in the inactive state. This query is used when the SDIO card host is able to
select a common voltage range or when the user requires notification that cards are not
usable.
20.4.4
Card identification process
The card identification process differs for MultiMediaCards and SD cards. For
MultiMediaCard cards, the identification process starts at clock rate F od . The SDIO_CMD
line output drivers are open-drain and allow parallel card operation during this process. The
registration process is accomplished as follows:
1.
2.
3.
4.
5.
6.
7.
8.
The bus is activated.
The SDIO card host broadcasts SEND_OP_COND (CMD1) to receive operation
conditions.
The response is the wired AND operation of the operation condition registers from all
cards.
Incompatible cards are placed in the inactive state.
The SDIO card host broadcasts ALL_SEND_CID (CMD2) to all active cards.
The active cards simultaneously send their CID numbers serially. Cards with outgoing
CID bits that do not match the bits on the command line stop transmitting and must wait
for the next identification cycle. One card successfully transmits a full CID to the SDIO
card host and enters the Identification state.
The SDIO card host issues SET_RELATIVE_ADDR (CMD3) to that card. This new
address is called the relative card address (RCA); it is shorter than the CID and
addresses the card. The assigned card changes to the Standby state, it does not react
to further identification cycles, and its output switches from open-drain to push-pull.
The SDIO card host repeats steps 5 through 7 until it receives a timeout condition.
For the SD card, the identification process starts at clock rate F od , and the SDIO_CMD line
output drives are push-pull drivers instead of open-drain. The registration process is
accomplished as follows:
1.
2.
3.
4.
5.
6.
7.
8.
The bus is activated.
The SDIO card host broadcasts SD_APP_OP_COND (ACMD41).
The cards respond with the contents of their operation condition registers.
The incompatible cards are placed in the inactive state.
The SDIO card host broadcasts ALL_SEND_CID (CMD2) to all active cards.
The cards send back their unique card identification numbers (CIDs) and enter the
Identification state.
The SDIO card host issues SET_RELATIVE_ADDR (CMD3) to an active card with an
address. This new address is called the relative card address (RCA); it is shorter than
the CID and addresses the card. The assigned card changes to the Standby state. The
SDIO card host can reissue this command to change the RCA. The RCA of the card is
the last assigned value.
The SDIO card host repeats steps 5 through 7 with all active cards.
For the SD I/O card, the registration process is accomplished as follows:
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Doc ID 13902 Rev 9
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