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SMSXXXAF датащи(PDF) 19 Page - Numonyx B.V |
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SMSXXXAF датащи(HTML) 19 Page - Numonyx B.V |
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19 / 61 page ![]() SMSxxxAF, SMSxxxFF, SMSxxxBF Secure digital memory card interface 19/61 Figure 10. Data Packet format 3.3 SD Memory Card Functional Description All communications between the host and the cards are controlled by the host (master). The host sends commands of two types: ● Broadcast commands which are intended for all cards. Some of these commands require a response. ● Addressed (point-to-point) commands that are sent to the addressed card and are followed by a response from the card. 3.4 Operation Modes Figure 11 and Figure 12 show an overview of the command flow for the Card Identification mode and the Data Transfer mode, respectively. Table 10 shows the relationship between operation modes and card states. Each state in the SD Memory Card state diagram (see Figure 16 and Figure 17) is associated with one operation mode. ai10036b Block Length Start Bit always '0' MSB (bit 4095) 0 CONTENT CRC 1 End bit always '1' Standard bus (only DAT0 used) LSB (bit 0) Block Length / 4 Start Bit always '0' MSB Number 0 CONTENT CRC 1 End bit always '1' Wide bus (all four data lines used) LSB Number 0 CONTENT CRC 1 0 CONTENT CRC 1 0 CONTENT CRC 1 DAT0 DAT2 DAT3 DAT1 4095 4093 4094 4092 3 2 1 0 Table 10. Card States vs. Operation Modes Card state Operation mode Inactive State Inactive Idle State Card Identification Mode Ready State Identification State |
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