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SMS01GAF bảng dữ liệu(PDF) 43 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
PDF  61 Pages
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nhà sản xuất  NUMONYX [Numonyx B.V]
Trang chủ  http://www.numonyx.com
Logo NUMONYX - Numonyx B.V

SMS01GAF bảng dữ liệu(HTML) 43 Page - Numonyx B.V

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SMSxxxAF, SMSxxxFF, SMSxxxBF
Serial peripheral interface (SPI) mode
43/61
Figure 31.
SD Memory Card System SPI Mode Bus Topology
7.2
SPI Bus Protocol
Whereas the SD channel is based on command and data bit streams initiated by a start bit
and terminated by a stop bit, the SPI channel is Byte-oriented. Every command or data
block is built up with 8-bit Bytes and is Byte-aligned to the CS signal (that is, the length is a
multiple of 8 clock cycles).
Like in the SD protocol, messages in the SPI protocol consist of command, response and
data-block tokens. All communications between host and cards are controlled by the host
(master). The host starts every bus transaction by asserting the CS signal Low.
The response behaviors in SPI mode and SD mode differ in three ways. In the SPI mode:
●
the selected card always responds to the command.
●
two additional (8 & 16 bit) response structures are used
●
when the card encounters a data retrieval problem, it sends an error response in place
of the expected data block (in the SD mode the card does not respond but implements
a timeout).
In addition to returning a response for every command received, the card returns a special
data response token for every data block received during write operations.
7.2.1
Mode Selection
The SD Memory Card wakes up in the SD mode. It will enter the SPI mode if the CS signal
is asserted (Low) when the Reset command (CMD0) is received.
The only way to return to the SD mode is to start a new power-down/power-up sequence.
In SPI mode, the SD Card protocol state machine does not apply.
CS(A)
VDD
VSS
CS
VDD
VSS
CLK, DataIN, DataOut
SD Memory
Card (A)
(SPI mode)
CS
VDD
VSS
CLK, DataIN, DataOut
SD Memory
Card (B)
(SPI mode)
CLK
DataIN
DataOut
CS
VDD
VSS
CLK, DataIN, DataOut
MultiMediaCard
(C)
(SPI mode)
ai10065
HOST
CS(B)
CS(B)



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