SMS512DFA5E NUMONYX, SMS512DFA5E Datasheet - Page 48

• 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

Serial peripheral interface (SPI) mode
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Read CID/CSD registers
In SPI mode the CID and CSD registers use a block read operation. When a Read
command is issued, the card returns a response message followed by a 16-byte data block
with a 16-bit CRC.
As T
read latency of the CSD register. N
Reset sequence
The SD memory card requires a defined reset sequence. After power-on reset or CMD0
(software reset) the card enters an idle state. When idle, the only host commands the card
will accept are CMD1 (SEND_OP_COND), ACMD41 (SD_SEND_OP_COND), CMD58
(READ_OCR), and CMD59 (CRC_ON_OFF).
For the thick (2.1 mm) SD memory card - CMD1 (SEND_OP_COND) is also valid - this
means that in SPI mode, CMD1 and ACMD41 have the same behaviors, but the usage of
ACMD41 is preferable since it allows easy distinction between an SD memory card and
MMC card. For the thin (1.4 mm) standard size SD memory card, CMD1 is an illegal
command during the initialization that is done after power-on. After power-on, once the card
has accepted valid ACMD41, it will be able to also accept CMD1 even if used after re-
initializing (CMD0) the card.
In the SPI mode, as opposed to the SD mode, CMD1 (and ACMD41) has no operands and
does not return the contents of the OCR register. Instead, the host may use CMD58
(available in SPI mode only) to read the OCR register.
SEND_IF_COND (CMD8) is used to verify SD memory card interface operating condition.
The argument format of CMD8 is the same as defined in the SD mode and the response
format of CMD8 is R7 (see SD memory card specification version 2.00).
Memory array partitioning
It is the same as in the SD mode.
Card Lock/Unlock commands
In the SPI mode, the Lock and Unlock commands are the same as in the SD mode.
Application Specific commands
The only difference between the SD and SPI modes is the APP_CMD status bit, which is not
available in the SPI mode.
SPI mode commands
All the SPI commands are 6-byte long. The command always starts with the MSB of the
string, which corresponds to the command code. See
format.
Like in the SD mode, the commands in the SPI mode are divided into classes. However, the
classes supported by the two modes are different. See
AAC
, the data read access time, is stored in the CSD register, it cannot be used as the
CR
(see
Table 27: Timing
Table 28
Table
values) is used instead.
for details.
for details of the command
SMSxxxDF