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參數資料
| 型號： | MC1GH256DACA-2SA00 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | SAMSUNG MultiMediaCard |
| 中文描述： | 三星多媒體 |
| 文件頁數： | 79/102頁 |
| 文件大小： | 1384K |
| 代理商： | MC1GH256DACA-2SA00 |
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MultiMediaCard
TM
79
Sep.22.2005
Revision 0.3
Introduction
The SPI mode consists of a secondary, optional communication protocol which is offered by Flash-based MultiMedi-
aCards. This mode is a subset of the MultiMediaCard protocol, designed to communicate with a SPI channel, commonly
found in Motorola’s (and lately a few other vendors’) microcontrollers. The interface is selected during the first reset com-
mand after power up (CMD0) and cannot be changed once the part is powered on.
The SPI standard defines the physical link only, and not the complete data transfer protocol. The MultiMediaCard SPI
implementation uses a subset of the MultiMediaCard protocol and command set. It is intended to be used by systems
which typically require one card and have lower data transfer rates (compared to MultiMediaCard protocol based sys-
tems). From the application point of view, the advantage of the SPI mode is the capability of using an off-the-shelf host,
hence reducing the design-in effort to minimum. The disadvantage is the loss of performance of the SPI mode versus Mul-
tiMediaCard mode (lower data transfer rate, hardware CS, etc.).
7.1 SPI Interface Concept
The Serial Peripheral Interface (SPI) is a general purpose synchronous serial interface originally found on certain Motorola
microcontrollers. A virtually identical interface can now be found on certain TI and SGS Thomson microcontrollers as well.
The MultiMediaCard SPI interface is compatible with SPI hosts available on the market. As in any other SPI device, the
MultiMediaCard SPI channel consists of the following four signals:
CS
: Host to card Chip Select signal.
CLK
:Host to card clock signal
DataIn
:Host to card data signal.
DataOut
: Card to host data signal.
Another SPI common characteristic is byte transfers, which is implemented in the card as well. All data tokens are multi-
ples of bytes (8 bit) and always byte aligned to the CS signal.
7.2 SPI Bus Topology
The card identification and addressing methods are replaced by a hardware Chip Select (CS) signal. There are no broad-
cast commands. For every command, a card (slave) is selected by asserting (active low) the CS signal (see Figure ).
The CS signal must be continuously active for the duration of the SPI transaction (command, response and data). The
only exception occurs during card programming, when the host can de-assert the CS signal without affecting the program-
ming process.
The bidirectional CMD and DAT lines are replaced by unidirectional
dataIn
and
dataOut
signals.
The MultiMediaCard pin assignment in SPI mode (compared to MultiMediaCard mode) is given in Table 7-1.
7. SPI Mode
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PDF描述 |
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| MC2GH01GDMCA-2SA00 | SAMSUNG MultiMediaCard |
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| MC2GH512DMCA-2SA00 | SAMSUNG MultiMediaCard |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MC1GU016HACA | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:MultiMediaCard Specification |
| MC1GU016HACA-0QC00 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:MultiMediaCard Specification |
| MC1GU016HACB-0QC00 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:MultiMediaCard Specification |
| MC1GU016HACC-0QC00 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:MultiMediaCard Specification |
| MC1GU016HAFA-0QC00 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:MultiMediaCard Specification |
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