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SMSXXXAF Datasheet(PDF) 20 Page - Numonyx B.V |
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SMSXXXAF Datasheet(HTML) 20 Page - Numonyx B.V |
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20 / 61 page  Secure digital memory card interface SMSxxxAF, SMSxxxFF, SMSxxxBF 20/61 3.4.1 Card Identification Mode The host enters the Card Identification mode after reset and remains in this mode until it has finished searching for new cards on the bus. Cards enter the Card Identification mode after reset and remain in this mode until they receive the SEND_RCA command (CMD3) (or the SET_RCA command for MultiMediaCards). While in Card Identification mode the host resets all the cards that are in Card Identification mode, validates the operation voltage range, identifies every card and asks them to publish their Relative Card Addresses (RCA). This operation is done separately for each card on its own CMD line. In this mode, all data communications use the command line (CMD) only. The host starts the card identification process at the identification clock rate fOD. The SD Memory Card has push-pull CMD line output drives. Once the bus has been activated the host asks each card to send their valid operation conditions (ACMD41 preceded by APP_CMD - CMD55 with RCA=0000h). The response to ACMD41 is the Operation Condition Register of the card. The same command is sent to all the new cards in the system. Incompatible cards are switched to Inactive State. The host then issues the ALL_SEND_CID command (CMD2), to every card to get their unique card identification (CID) numbers. All unidentified cards (which are in Ready State) answer by sending their CID numbers (on the CMD line) and switch to the Identification State. Then the host issues a CMD3 (SEND_RELATIVE_ADDR) command to ask the cards to publish a relative card address (RCA). The RCA is shorter than the CID, and will be used to address the card (typically at a clock rate higher than fOD) once this is in Data Transfer mode. Once the RCA is received the card state changes to Standby. At this point, the host may ask the card to publish another RCA number by sending another SEND_RELATIVE_ADDR command to the card. The last published RCA is the actual RCA of the card. The host repeats the identification process, that is the cycles with CMD2 and CMD3, for each card in the system. Once all the SD Memory Cards have been initialized, the host initializes the MultiMediaCards that are in the system (if any) by issuing CMD2 and CMD3 as explained in the MultiMediaCard specification. Note that in the SD system all the cards are connected separately so each MultiMediaCard has to be initialized individually. Stand-by State Data Transfer Mode Transfer State Sending-data State Receive-data State Programming State Disconnect State Table 10. Card States vs. Operation Modes (continued) Card state Operation mode |
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