SDMJ-128 SanDisk, SDMJ-128 Datasheet - Page 36

• Manufacturer Part Number: SDMJ-128
• Manufacturer: SanDisk
• Type: MultiMedia Cardr

Specifications of SDMJ-128

• Density: 128MByte
• 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
3.5.5
3.5.6
3.6
Relative Card Address Register
MultiMediaCard Registers in SPI Mode
File System Format
The 16-bit Relative Card Address (RCA) Register carries the card address that is published
by the card during the card identification. This address is used for the addressed host-card
communication after the card identification procedure.
In SPI mode, only the MultiMediaCard CSD and CID registers are accessible. Their format
is identical to the format in the MultiMediaCard mode. However, a few fields are irrelevant
in SPI mode.
In SPI mode, the card status register has a different, shorter format as well. Refer to the SPI
Protocol section for more details.
SanDisk MultiMediaCards and RS-MultiMediaCards are formatted with a “hard disk-like”
partitioned DOS FAT file system.
Similar to hard disks in PCs, the first data block of the memory consists of a partition table.
Thus, using the same notation as for hard disks, i.e., partitioning the memory field into
logical sectors of 512 bytes each, the first sector is reserved for this partition table. Table 3-
29 shows how the data in this sector is structured.
Table 3-29
Table 3-30
Byte Position
Byte Position
0x1be
0x1de
0x1ee
0x1fe
0xce
0x1ff
0x0
0x0
0x1
0x4
Length (bytes)
Length (bytes)
Partition Entry Description
446
16
16
16
16
1
1
1
3
1
Consistency check routine
Partition Table entry
Partition Table entry
Partition Table entry
Partition Table entry
Signature
Signature
Boot descriptor
First partition sector
File system descriptor
3-21
Entry Description
MultiMediaCard and RS-MultiMediaCard Product Manual
Entry Description
0x00 (Non-bootable device)
0x80 (Bootable device)
Address of First Sector
0 = Empty
1 = DOS 12-bit FAT < 16 MB
4 = DOS 16-bit FAT < 32 MB
5 = Extended DOS
6 = DOS 16-bit FAT >= 32 MB
0x10-0xff = Free for other File
Systems*
Chapter 3 –Interface Description
Value/Range
See Table 3-30
See Table 3-30
See Table 3-30
See Table 3-30
0x55
0xaa
Value/Range
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07/15/05