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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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SMS01GAF Datasheet(PDF) 16 Page - Numonyx B.V |
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SMS01GAF Datasheet(HTML) 16 Page - Numonyx B.V |
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16 / 61 page  Secure digital memory card interface SMSxxxAF, SMSxxxFF, SMSxxxBF 16/61 Figure 4. Secure Digital Memory Card system bus topology 1. DAT1 and DAT2 not connected. 3.2 SD bus protocol Communication over the SD bus is based on command and data bit streams which are initiated by a start bit and terminated by a stop bit. ● Command: a command is a token which starts an operation. A command is sent from the host either to a single card (addressed command) or to all connected cards (broadcast command). Commands are transferred serially on the CMD line. See Figure 5: "No Response" and "No Data" operations. The Command token format is shown in Figure 8 ● Response: a response is a token which is sent from an addressed card, or (simultaneously) from all connected cards, to the host, as an answer to a previously received command. Responses are transferred serially on the CMD line. A response is illustrated in Figure 5: "No Response" and "No Data" operations. The Response token format is shown in Figure 9 ● Data: data can be transferred from the card to the host or from the host to the card. Data is transferred via the data lines. See Figure 6: (Multiple) Block Read operation for an illustration. The Data Packet format is shown in Figure 10 Card addressing is implemented using a session address assigned to the card during the initialization phase (See SD Memory Card Specification, Chapter 4). The basic transaction on the SD bus is the command/response transaction. In this type of bus transactions, the information is directly transferred within the command or response structure. In addition, some operations have a data token. Data transfers to/from the SD Memory Card are done in blocks. Data blocks are always followed by CRC bits. Single and Multiple Block operations are supported. Note that the Multiple Block operation mode improves the speed of write operations. A Multiple Block transmission is terminated by issuing a STOP_TRANSMISSION command on the CMD line (See Figure 6 and Figure 7). CLK VDD VSS DAT0-DAT3(A) CMD(A) CLK VDD VSS DAT0-DAT3 CMD SD Memory Card (A) CLK VDD VSS DAT0-DAT3 CMD SD Memory Card (B) DAT0-DAT3(B) CMD(B) CLK VDD VSS DAT0, CS, CMD(1) DAT0-DAT3(C) CMD(C) MultiMediaCard (C) ai10029 HOST |
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