MC2GH256NMCA-2SA00 SAMSUNG [Samsung semiconductor], MC2GH256NMCA-2SA00 Datasheet - Page 84

• Manufacturer Part Number: MC2GH256NMCA-2SA00
• Description: SAMSUNG MultiMediaCard
• Manufacturer: SAMSUNG [Samsung semiconductor]

If the host uses partial blocks whose accumulated length is not block aligned, and block misalignment is not allowed, the
card shall detect a block misalignment error condition during the transmission of the first misaligned block and the content
of the further transferred bits is undefined. As the host sends CMD12, the card will respond with the
ADDRESS_MISALIGN bit set.
The SPI mode supports single block and Multiple block write commands. Upon reception of a valid write command
(CMD24 or CMD25), the card will respond with a response token and will wait for a data block to be sent from the host.
CRC suffix, block length and start address restrictions are (with the exception of the CSD parameter WRITE_BL_PARTIAL
controlling the partial block write option) identical to the read operation (see Figure 7-5). If a CRC error is detected it will be
reported in the data-response token and the data block will not be programmed.
Every data block has a prefix of ‘Start Block’ token (one byte).
After a data block has been received, the card will respond with a data-response token. If the data block has been
received without errors, it will be programmed. As long as the card is busy programming, a continuous stream of busy
tokens will be sent to the host (effectively holding the DataOut line low).
In Multiple Block write operation the stop transmission will be done by sending ‘Stop Tran’ token instead of ‘Start Block’
token at the beginning of the next block.
Two types of multiple block write transactions, identical to the multiple block read, are defined (the host can use either one
at any time):
•
The number of blocks for the write multiple block operation is not defined. The card will continuously accept and program
data blocks until a ‘Stop Tran’ token is received.
7.8 Data Write
Revision 0.3
DataIn
DataOut
Open-ended Multiple block write
DataIn
DataOut
to card
from
host
to card
from
host
command
command
response
Figure 7-6 : SPI Multiple Block Write Operation
to host
response
Figure 7-5 : SPI Single Block Write Operation
from
card
to host
from
card
block
data
Token
Block
Start
data block
data from
Token
Block
Start
to card
response
host
data
84
data from
to card
host
response and
busy
busy from
data_response
Data
card
block
data
response and busy
data from
to card
host
to host
Data
from
card
busy
response
data
MultiMediaCard
command
busy
new command
from host
Sep.22.2005
busy
Token
to card
Stop
Tran
TM