SMS512DFA5E NUMONYX, SMS512DFA5E Datasheet - Page 19

• Manufacturer Part Number: SMS512DFA5E
• Description: MICROSD CARD SMS 512MB FLASH MEM
• Manufacturer: NUMONYX

Specifications of SMS512DFA5E

• Memory Size: 512MB
• Memory Type: SD (Secure Digital)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SMSxxxDF
Secure digital memory card interface
application specific command, therefore APP_CMD (CMD55) shall always precede
ACMD41. The RCA to be used for CMD55 in idle state shall be the card’s default RCA =
0x0000.
After the host issues a reset command (CMD0) to reset the card, the host shall issue CMD8
before ACMD41 to re-initialize the SD memory card.
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 f
) once this is in data transfer
OD
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.
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