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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SMS01GAF 데이터시트(PDF) 38 Page - Numonyx B.V |
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SMS01GAF 데이터시트(HTML) 38 Page - Numonyx B.V |
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38 / 61 page  Timings SMSxxxAF, SMSxxxFF, SMSxxxBF 38/61 Figure 23. Multiple Block Read Command Figure 24. STOP_TRANSMISSION Command (CMD12, Data Transfer Mode) 6.3 Data Write 6.3.1 Single Block Write The host selects one card for the data write operation by issuing CMD7. The host sets the valid block length for block oriented data transfer by issuing CMD16. Figure 25 shows the timings of a basic bus write operation. The sequence starts with a Single Block Write command (CMD24) which determines (in the argument field) the start address. The card responds on the CMD line. Data transfer from the host starts NWR clock cycles after the card response is received. CRC check bits are appended to the data sent by the host 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'). Note that the CRC response is always output two clock cycles after the data. If the card does not have any Data Receive buffer available, it indicates this condition by pulling the DAT0 data line to Low. It will stop pulling DAT0 to Low as soon as at least one Data Receive buffer for the defined data transfer block length becomes available. The level of DAT0 does not give any information about the data write status. The host can obtain this information by issuing a CMD13 (SEND_STATUS) to the card. S T CONTENT CRC E Z * P S T Host Command Response NCR Cycles ai10051 CONTENT CRC E CMD Z P Z **** Z Z Z Z ZZ Z Z P ******* P S D D D NAC Cycles Read Data DAT Z Z P P P P P P P PP CONTENT CRC E P ******* S D D P P PP P NAC Cycles Read Data S T CONTENT CRC E Z * * * P S T Host Command Response NCR Cycles ai10052 CONTENT CRC E CMD Z P D * * * * * * * * D D D D DE Z Z * * * * * * * * * * * * * * * * * * * * DAT |
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