SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 9

• 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
1.12.6
1.12.7
Read and Write Operations
Data Protection in the Flash Card
The MultiMediaCard/RS-MultiMediaCard supports two read/write modes as shown in
Figure 1-3 and defined in Table 1-2.
Figure 1-3
Table 1-2
Every sector is protected with an error correction code. The ECC is generated (in the
memory card) when the sectors are written and validated when the data is read. If defects
are found, the data is corrected prior to transmission to the host.
Single Block
Multiple Block
Mode
Memory
Memory
Sectors
Sectors
In this mode the host reads or writes one data block in a pre-specified length. The
data block transmission is protected with 16-bit CRC that is generated by the
sending unit and checked by the receiving unit.
The block length for read operations is limited by the device sector size (512 bytes)
but can be as small as a single byte. Misalignment is not allowed. Every data block
must be contained in a single physical sector.
The block length for write operations must be identical to the sector size and the
start address aligned to a sector boundary.
This mode is similar to the single block mode, except for the host can read/write
multiple data blocks (all have the same length) that are stored or retrieved from
contiguous memory addresses starting at the address specified in the command.
The operation is terminated with a stop transmission command.
Misalignment and block length restrictions apply to multiple blocks and are identical
to the single block read/write operations.
Start Address
Data Transfer Formats
Mode Definitions
Single Block Mode
(Read)
Memory
Sectors
Memory
Sectors
Start Address
Memory
Sectors
Memory
Sectors
Start Address
Multiple Block Mode
1-7
(Write)
Write
Memory
Sectors
Memory
Sectors
MultiMediaCard/RS-MultiMediaCard Product Manual
Stop
Description
Memory
Sectors
Memory
Sectors
Start
Misalignment Error
Start Address
(Read/Write)
Memory
Sectors
Memory
Sectors
Read
Chapter 1 – Introduction
Memory
Sectors
Memory
Sectors
Stop
03/22/05