SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 63

• Manufacturer Part Number: SDMJ-32
• Manufacturer: SanDisk
• Type: MultiMedia Cardr

Specifications of SDMJ-32

• Density: 32MByte
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (min): -25C
• Operating Temperature (max): 85C
• Package Type: MMC
• Mounting: Socket
• Pin Count: 7
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Programmable: Yes
• Lead Free Status / RoHS Status: Compliant

Revision 1.3
© 2005 SanDisk Corporation
4.10
Data Write
Timing of Multiple Block Read Command
Timing of Stop Command (CMD12, Data Transfer Mode)
Single Block Write
The host selects one card for data write operation by CMD7. The host sets the valid block
length for block-oriented data transfer by CMD16.
The basic bus timing for a write operation is shown in the Block Write Command timing
diagram. The sequence starts with a single block write command, CMD24 that determines
(in the argument field) the start address. The card responds on the CMD line, and the data
transfer from the host starts N
The data is suffixed with CRC check bits to allow the card to check it for transmission
errors. The card sends back the CRC check result as a CRC status token on the data line. In
the case of transmission error, the card sends a negative CRC status (“101”). In the case of
non-erroneous transmission, the card sends a positive CRC status (“010”) and starts the
data programming procedure.
Block Write Command Timing
If the MultiMediaCard/RS-MultiMediaCard does not have a free data receive buffer, it
indicates this condition by pulling down the data line to low. The card stops pulling down
the data line as soon as at least one receive buffer for the defined data transfer block length
becomes free. This signaling does not give any information about the data write status that
must be polled by the host.
CMD S T
DAT Z Z
CMD S T
DAT
Command
Host
CMD E Z
DAT Z Z
D D D
Host Command
Z
Content
Host Command
****
Z P *
Content
N
CR
****
Z Z Z
********
CRC
P S
Z Z Z
E Z
Z Z
CRC
T
N
Card Response
WR
Content
N
D D D E Z Z
Z P
Z
CR
N
WR
***
Cycles
P
AC
E Z
Cycles
*
**********
clock cycles after the card response was received.
CRC
Z Z Z
P S T
4-25
Z P
N
E
CR
P S D D
Z Z P
Z P*P
Cycles
Content
***
MultiMediaCard/RS-MultiMediaCard Product Manual
S
Chapter 4 – MultiMediaCard Protocol Description
CRC
Read Data
P S T
Content
D
*****
Write Data
******************
E
CRC
Z
**********
Z P
D E P
Content
Response
E Z Z S Status
Response
P
P
N
**********
AC
P P
Cycles
CRC Status
CRC
P
P
P P
P
P
E S
P
S
E
Read Data
P
P
D
Busy
P
L*L
P
D
04/22/05
P
P P P
D D D
P
E Z
P