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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SMS01GAF 데이터시트(PDF) 46 Page - Numonyx B.V |
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SMS01GAF 데이터시트(HTML) 46 Page - Numonyx B.V |
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46 / 61 page  Serial peripheral interface (SPI) mode SMSxxxAF, SMSxxxFF, SMSxxxBF 46/61 7.2.6 Read CID/CSD Registers In SPI mode the CID and CSD Registers use a Block Read operation. When a Read command is issued, the card returns a response message followed by a 16 Byte data block with a 16-bit CRC. As TAAC, the Data Read Access Time, is stored in the CSD Register, it cannot be used as the read latency of the CSD Register. NCR (see Table 25: Timing Values) is used instead. 7.2.7 Reset Sequence The SD Memory Card requires a defined reset sequence. After power-on reset or CMD0 (software reset) the card enters an idle state. When idle, the only host commands the card will accept are CMD1 (SEND_OP_COND), ACMD41 (SD_SEND_OP_COND) and CMD58 (READ_OCR). In SPI mode CMD1 and ACMD41 have the same function. The host must poll the card (by repeatedly sending CMD1 or ACMD41) until the 'in-idle-state' bit in the card response switches to Low, thus indicating that the card has completed its initialization process and is ready for the next command. In the SPI mode, as opposed to the SD mode, CMD1 (and ACMD41) has no operands and does not return the contents of the OCR register. Instead, the host may use CMD58 (available in SPI mode only) to read the OCR register. Also it is up to the host to pay attention not to gain access to cards that do not support its voltage range. The use of CMD58 is not restricted to the initializing phase, it can be issued at any time. 7.2.8 Memory Array Partitioning. It is the same as in the SD mode. 7.2.9 Card Lock/Unlock Commands. In the SPI mode, the Lock and Unlock commands are the same as in the SD mode. 7.2.10 Application Specific Commands. The only difference between the SD and SPI modes is the APP_CMD status bit, which is not available in the SPI mode. 7.3 SPI Mode Commands All the SPI commands are 6 Bytes long. The command always starts with the MSB of the string, which corresponds to the command code. See Table 26 for details of the command format. Like in the SD mode, the commands in the SPI mode are divided into classes. However, the classes supported by the two modes are different. See Table 27 For details. The commands supported in the SPI mode are described in detail in Table 27 If no argument is required in the command, the value of the field should be set to '0'. Reserved commands are reserved in both the MultiMediaCard and SPI modes. The contents of the |
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