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MC12H064NBCA-2SA00 Datasheet(PDF) 87 Page - Samsung semiconductor |
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MC12H064NBCA-2SA00 Datasheet(HTML) 87 Page - Samsung semiconductor |
87 / 102 page MultiMediaCardTM 87 Sep.22.2005 Revision 0.3 7.13 Error Conditions 7.13.1 CRC and Illegal Command All commands are (optionally) protected by CRC (cyclic redundancy check) bits. If the addressed MultiMediaCard's CRC check fails, the COM_CRC_ERROR bit will be set in the card's response. Similarly, if an illegal command has been received the ILLEGAL_COMMAND bit will be set in the card's response. There are different kinds of illegal commands: • Commands which belong to classes not supported by the MultiMediaCard (e.g. interrupt and I/O commands). • Commands not allowed in SPI mode (e.g. CMD20 - write stream) • Commands which are not defined (e.g. CMD47). 7.13.2 Read, Write, Erase And Force Erase Time-out Conditions The time period after which a time-out condition for read/write/erase operations occurs are (card independent) 10 times longer than the typical access/program times for these operations given below. A card shall complete the command within this time period, or give up and return an error message. If the host does not get a response within the defined time-out it should assume the card is not going to respond any more and try to recover (e.g. reset the card, power cycle, reject, etc.). The typical access and program times are defined as follows: 7.13.3 Read The read access time is defined as the sum of the two times given by the CSD parameters TAAC and NSAC. These card parameters define the typical delay between the end bit of the read command and the start bit of the data block. This num- ber is card dependent. 7.13.4 Write The R2W_FACTOR field in the CSD is used to calculate the typical block program time obtained by multiplying the read access time by this factor. It applies to all write/erase commands (e.g. SET(CLEAR)_WRITE_PROTECT, PROGRAM_CSD(CID) and the block write commands). 7.13.5 Erase The duration of an erase command will be (order of magnitude) the number of write blocks to be erased multiplied by the block write delay. 7.13.6 Force Erase The Force Erase time-out is specified in Chapter 6.5.2 |
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