MC1GH128NACA-2SA00 Просмотр технического описания (PDF) - Samsung

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MC1GH128NACA-2SA00

SAMSUNG MultiMediaCard

Samsung 

Revision 0.3

MultiMediaCardTM

3.9 SPI Mode

The SPI mode is a secondary (optional) communication protocol offered for MultiMediaCard. This mode is a subset of the

MultiMediaCard protocol, designed to communicate with an SPI channel, commonly found in Motorola’s(and lately a few

other vendors’) microcontrollers.

3.9.1 Negotiating Operation Conditions

The operating condition negotiation function of the MultiMediaCard bus is not supported in SPI mode. The host must work

within the valid voltage range (2.7 to 3.6 volts) of the card.

3.9.2 Card Acquisition and Identification

The card acquisition and identification function of the MultiMediaCard bus is not supported in SPI mode. The host must

know the number of cards currently connected on the bus. Specific card selection is done via the CS signal.

3.9.3 Card status

In SPI mode only 16bits (containing the errors relevant to SPI mode) can be read out of the MultiMediaCard status regis-

ter.

3.9.4 Memroy Array Partitioning

Memory partioning in SPI mode is equivalent to MultiMediaCard mode. All read and write commands are byte address-

able.

3.9.5 Read and Write Operations

In SPI mode, only single block read/write mode is supported.

3.9.6 Data Transfer Rate

In SPI mode, only single block mode is supported. The typical access time (latency) for each data block, in read opera-

tion, is 1.5ms. The write typical access time (latency) for each data block, in read operation, is 1.5ms. The write block

operation is done in handshake mode. The card will keep DataOut line low as long as the write operation is in progress

and there are no write buffers available.

3.9.7 Data protection in the MultiMediaCard

Same as in the MultiMediaCard mode.

3.9.8 Erase

Same as in the MultiMediaCard mode.

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Sep.22.2005

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