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SMS01GAF bảng dữ liệu(PDF) 44 Page - Numonyx B.V

tên linh kiện SMS01GAF
Giải thích chi tiết về linh kiện  64 MByte, 128 MByte, 256 MByte 512 MByte and 1 GByte, 3.3V Supply Secure Digital??Card
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nhà sản xuất  NUMONYX [Numonyx B.V]
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SMS01GAF bảng dữ liệu(HTML) 44 Page - Numonyx B.V

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Serial peripheral interface (SPI) mode
SMSxxxAF, SMSxxxFF, SMSxxxBF
44/61
7.2.2
Bus Transfer Protection
On entering the SPI mode the card defaults to the non-protected mode where there is no
CRC (Cyclic Redundancy Check). So systems using reliable data links are not obliged to
have the hardware and firmware necessary to implement CRC functions.
In non-protected mode, the CRC bits are still present but are Don't Care. The CRC option
can be turned on and off by the host through the CRC_ON_OFF command (CMD59).
7.2.3
Data Read
Single and Multiple Block Read operations are supported in SPI mode. The main difference
with the SD mode is that in SPI mode data and responses to the host are both sent on the
DataOut line. As a consequence the data transfer may be interrupted and the last data
block, replaced by the response to a STOP_TRANSMISSION command.
The basic unit of data transfer is the block. The maximum size of a block is defined in the
CSD Register (READ_BL_LEN).
If READ_BL_PARTIAL is set, smaller blocks entirely contained in a physical block (as
defined by READ_BL_LEN) may also be transmitted. Single Block Read operations are
initiated by issuing the READ_SINGLE_BOCK command (CMD17). The start address can
be any Byte in the valid address range of the card. Every block, however, must be contained
in a single physical card sector.
Multiple Block Read operations are initiated by issuing the READ_MULTIPLE_BLOCK
command (CMD18) and every transferred block has a 16-bit CRC appended to it. The
STOP_TRANSMISSION command (CMD12) will actually stop the data transfer operation
(just like in the SD mode).
Figure 32.
Read Operation Mechanism
Figure 33.
Multiple Block Read Operation
Command
Command
Data in
Data out
ai10066
from Card
to Host
from Host
to Card
next command
Response
Data Block CRC
data from Card
to Host
Command
STOP_TRANSMISSION
Command
Data in
Data out
ai10067
from Card
to Host
from Host
to Card
next command
Response
Data Block CRC
data from Card
to Host
Data Block CRC
Data B.
Response



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