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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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SMS01GAF bảng dữ liệu(PDF) 22 Page - Numonyx B.V |
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SMS01GAF bảng dữ liệu(HTML) 22 Page - Numonyx B.V |
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22 / 61 page  Secure digital memory card interface SMSxxxAF, SMSxxxFF, SMSxxxBF 22/61 When CMD7 is issued with the reserved relative card address "0000h", all cards revert to the Standby State. This function may be used before identifying new cards, to avoid resetting already registered cards. When in Standby state the cards that already have an RCA do not respond to identification commands (CMD41, CMD2, CMD3). Note that a card is deselected when it receives a CMD7 with an RCA that does not match. Card deselection is automatic if another card in a system is selected and the cards share the same CMD lines. So, in an SD Memory Card system, the host may either have a common CMD line for all SD Memory Cards (in which case card deselection is automatic just like in a MultiMediaCard system) or the host may have separate CMD lines, in which case it must be aware of the necessity of deselecting cards. All data communications in the Data Transfer Mode are point-to point between the host and the selected card (using addressed commands). All addressed commands are acknowledged by a response on the CMD line. The relationships between the various states in the Data Transfer mode are summarized below (see Figure 12): ● All Data Read commands (CMD17, CMD18, CMD30, CMD56, ACMD51) can be aborted at any time using the Stop command (CMD12). The data transfer will terminate and the card will return to the Transfer State. ● All Data Write commands (CMD24,CMD25, CMD26, CMD27, CMD42, CMD56) can be aborted at any time using the Stop command (CMD12). The write commands must be stopped prior to deselecting the card using CMD7. ● As soon as the data transfer has completed, the card switches from the Data Write state to either the Programming state (if the transfer was successful) or the Transfer state (if the transfer failed). ● If a Block Write operation is stopped and the block length and CRC of the last block are valid, the data will be programmed. ● The card can provide buffering during Block Write. This means that the data to be programmed to the next block can be sent to the card while the previous block is being programmed. If all write buffers are full, the DAT0 line will remain Low (BUSY) as long as the card is in the Programming state (see Figure 12). ● There is no buffering option for Write CSD, Write CID, Write Protection and erase. This means that while the card is busy with any one of these commands, no other Data Transfer command will be accepted. The DAT0 line will remain Low as long as the card is busy and in the Programming state. ● Parameter Set commands (CMD16, CMD32, CMD33) are not allowed while the card is programming. ● Read commands are not allowed while the card is programming. ● Switching another card from the Standby to the Transfer state (using CMD7) will not terminate erase and programming operations. The card will switch to the Disconnect state and release the DAT line. ● A card in the Disconnect state can be reselected using CMD7. The card will then revert to the Programming state and reactivate the busy signaling. ● Resetting a card (using CMD0 or CMD15) will terminate any pending or ongoing programming operation. This may result in the loss of card contents. It is up to the host to prevent possible data loss. |
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