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參數(shù)資料
| 型號： | MX53L06402L-50 |
| 廠商： | MACRONIX INTERNATIONAL CO LTD |
| 元件分類： | PROM |
| 英文描述： | FLASH 2.7V PROM CARD, XMA7 |
| 封裝： | CRAD-7 |
| 文件頁數(shù)： | 22/55頁 |
| 文件大?。?/td> | 262K |
| 代理商： | MX53L06402L-50 |
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29
P/N: PM1043
REV. 1.0, NOV. 25, 2003
MX53L06402
7.5 SPI Bus Protocol
While the MultiMediaCard channel is based on command and data bit streams which are initiated by a start bit and
terminated by a stop bit, the SPI channel is byte oriented. Every command or data block is built of 8-bit bytes and is
byte aligned to the CS signal (i.e. the length is a multiple of 8 clock cycles).
Similar to the MultiMediaCard protocol, the SPI messages consist of command, response and data-block tokens (see
Chapter 3 for a detailed description). All communication between host and cards is controlled by the host (master).
The host starts every bus transaction by asserting the CS signal
low.
The response behavior in the SPI mode differs from the MultiMediaCard mode in the following three aspects:
The selected card always responds to the command.
An additional (8 bit) response structure is used
When the card encounters a data retrieval problem, it will respond with an error response (which replaces the
expected data block) rather than by a time-out, as in the MultiMediaCard mode.
Only single block read operations are supported in SPI mode. A data block may be as big as one card sector and as
small as a single byte. Partial block read operations are enabled by card options specified in the CSD register.
7.5.1 Mode Selection
The MultiMediaCard wakes up in the MultiMediaCard mode. It will enter SPI mode if the CS signal is asserted
(negative) during the reception of the reset command (CMD0). Selecting SPI mode is not restricted to Idle state (the
state the card enters after power up) only. Every time the card receives CMD0, including while in Inactive state, CS
signal is sampled.If the card recognizes that the MultiMediaCard mode is required, it will not respond to the command
and remain in the MultiMe-diaCard mode. If SPI mode is required, the card will switch to SPI and respond with the SPI
mode R1 response.
The only way to return to the MultiMediaCard mode is by entering the power cycle. In SPI mode, the MultiMediaCard
protocol state machine is not observed. All the MultiMediaCard commands sup-ported in SPI mode are always
available.
7.5.2 Bus Transfer Protection
Every MultiMediaCard token transferred on the bus is protected by CRC bits. In SPI mode, the MultiMediaCard offers
a non-protected mode which enables systems built with reliable data links to exclude the hardware or firmware
required for implementing the CRC generation and verification functions.
In the non-protected mode, the CRC bits of the command, response and data tokens are still required in the tokens.
However, they are defined as "don't care" for the transmitter and ignored by the receiver.
The SPI interface is initialized in the non-protected mode. However, the RESET command (CMD0), which is used to
switch the card to SPI mode, is received by the card while in MultiMediaCard mode and, therefore, must have a valid
CRC field.
Since CMD0 has no arguments, the content of all the fields, including the CRC field, are constants and need not be
calculated in run time. A valid reset command is:
0x40, 0x0, 0x0, 0x0, 0x0, 0x95
The host can turn the CRC option on and off using the CRC_ON_OFF command (CMD59).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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