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SMSXXXAF Datasheet(PDF) 39 Page - Numonyx B.V |
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SMSXXXAF Datasheet(HTML) 39 Page - Numonyx B.V |
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39 / 61 page  SMSxxxAF, SMSxxxFF, SMSxxxBF Timings 39/61 Figure 25. Block Write Command 6.3.2 Multiple Block Write In Multiple Block Write mode, the write command from the host is followed by a continuous flow of data blocks from the host. The data flow is terminated by a STOP_TRANSMISSION command (CMD12). As in the case of a Single Block Write operation, CRC check bits are appended to the data sent to allow the card to check for transmission errors. The card returns the CRC check result as a CRC status token on the DAT0 line. If a transmission error occurred, the card returns a negative CRC status ('101'). If the transmission completed successfully, the card returns a positive CRC status ('010') and starts programming the data. If an error occurred while programming the Flash memory, the card ignores all further data blocks. In this case the card will not send any CRC response and so, there will be no CRC start bit on the bus and the three CRC status bits will read ('111'). Figure 26 describes a Multiple Block data transmission with and without a card busy signal. Figure 26. Multiple Block Write Command 6.4 STOP_TRANSMISSION Command The STOP_TRANSMISSION command works in the same way as in the read mode. Figure 27 to Figure 30 describe the timings of the STOP_TRANSMISSION command in different card states. The card will consider that a data block was successfully received and is ready for programming only if the CRC data of the block was validated and the CRC status token, returned to the host. Figure 28 is an example of an interrupted (by a STOP_TRANSMISSION command from the host) attempt to transmit the CRC status token. The result is the same as in other examples S EZ * P S T Host Command Card Response NCR ai10053 CONTENT CRC E CMD Z P Z * * * * * * * Z Z ZZ Z * * * P * P L * L EZ NWR DAT0 Z Z P X X P P PP CONTENT CRC E Z E S P P PP Status Busy Write Data * * * * * * * * * * * * * * * * * * ZZ ZZ S S Z * * * * * * * Z Z ZZ Z * * * P * P XZ DAT1-DAT3 CONTENT CRC E Z X X ZZ ZZ XX X X CRC Status EZ Card Response ai1005 CMD Z NWR DAT P P P PP P P PP Write Data * * * * * * * * * * * * * * * * * * CRC Status P P PP P * * * * * * * * * * * * * * * * * * P P * P S E Z Status S S Z P * P Data+CRC E Z ZZ L * L E E S Status S Data+CRC E Z ZZ P * P NWR Write Data CRC Status NWR Busy |
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