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SMSXXXAF Datasheet(PDF) 19 Page - Numonyx B.V

Part # SMSXXXAF
Description  64 MByte, 128 MByte, 256 MByte 512 MByte and 1 GByte, 3.3V Supply Secure Digital??Card
PDF  61 Pages
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Manufacturer  NUMONYX [Numonyx B.V]
Direct Link  http://www.numonyx.com
Logo NUMONYX - Numonyx B.V

SMSXXXAF Datasheet(HTML) 19 Page - Numonyx B.V

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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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