MC2GH256NMCA-2SA00 SAMSUNG [Samsung semiconductor], MC2GH256NMCA-2SA00 Datasheet - Page 74

• Manufacturer Part Number: MC2GH256NMCA-2SA00
• Description: SAMSUNG MultiMediaCard
• Manufacturer: SAMSUNG [Samsung semiconductor]

• Single Block Read
The host selects one card for data read operation by CMD7, and sets the valid block length for block oriented data transfer
by CMD16. The basic bus timing for a read operation is given in Figure 6-12. The sequence starts with a single block read
command (CMD17) which specifies the start address in the argument field. The response is sent on the CMD line as
usual.
CMD
DAT0-7
Data transmission from the card starts after the access time delay N
After the last data bit, the CRC check bits are suffixed to allow the host to check for transmission errors.
• Multiple Block Read
In multiple block read mode, the card sends a continuous flow of data blocks following the initial host read command. The
data flow is terminated by a stop transmission command (CMD12). Figure 6-13 describes the timing of the data blocks and
Figure 6-14 the response to a stop command. The data transmission stops two clock cycles after the end bit of the stop
command.
CMD
DAT0-7
CMD
DAT0-7
6.13 Data Read
Revision 0.3
←⎯ Host Command ⎯⎯→ ← N
←⎯⎯ Host Command ⎯⎯→ ←⎯ N
S T
Z Z Z * * * * Z Z Z Z Z Z P * * * * * * * * * * P S D D D * * *
S T
Z Z Z
←⎯⎯⎯ Valid Read data ⎯⎯⎯⎯→
←⎯⎯⎯ Host Command ⎯⎯→ ←⎯⎯ N
D D D * * * * * * * * D D D
S T
content
content
* * * * *
Figure 6-14 : Stop Command Timing (CMD12, Data Transfer Mode)
content
CRC E Z Z P
CRC E Z Z P * * * P S T
Z Z Z Z P
CRC
Figure 6-13 : Multiple Block Read Timing
←⎯⎯⎯ N
Figure 6-12 : Single Block Read Timing
←⎯⎯⎯ N
CR
E
cycles ⎯→ ←⎯⎯⎯ Response ⎯⎯→
CR
←
Z
* *
N
* * * * * * *
AC
cycles ⎯→ ←⎯⎯ Response ⎯⎯⎯→
ST
Z
E
cycles ⎯⎯→ ←⎯⎯⎯ Read Data ⎯⎯→ ←⎯ N
AC
→
P S T
cycles ⎯⎯⎯→ ←⎯⎯ Read Data
CR
Z Z
P
74
cycles ⎯→ ←⎯⎯⎯⎯ Response ⎯⎯⎯⎯⎯→
* * *
P S D D D * * * * D E P * * * * * * P S D D D D
content
AC
P
* * * * * * * * * * * * * * * * * * * *
content
beginning from the end bit of the read command.
S T
CRC E Z Z P P * * * * * * P P P P P P
CRC E
content
MultiMediaCard
CRC
AC
cycles → ←⎯ Read Data
E
Sep.22.2005
TM