SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 52

• 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
4.6.1
4.6.2
4.6.3
4.6
Commands
Command Types
Command Format
Command Classes
The following sections provide important information on commands.
There are four kinds of commands defined to control the MultiMediaCard/RS-
MultiMediaCard bus as shown in Table 4-4.
Table 4-4
The command transmission always starts with the most significant bit (MSB).
The command length shown in Figure 4-5 is 48 bits.
Figure 4-5
Commands and arguments are listed in Table 4-6.
The command set of the MultiMediaCard/RS-MultiMediaCard is divided into several
classes (refer to Table 4-5). Each class supports a set of card functions.
The supported Card Command Classes (CCC) are coded as a parameter in the CSD
Register data of each card, providing the host with information on how to access the card.
3
Broadcast
Broadcast w/Response
Addressed point-to-point
Addressed point-to-point data transfer
All cards simultaneously.
start bit
0
7-bit CRC Calculation: G(x) = x
M(x) = (start bit)*x
CRC[6…0] = Remainder[(M(x)*x
Command
host
1
Command Definition
Format (2.4 µs @ 20 MHz)
bit 5….bit 0
command
39
+ (host bit)*x
4-14
Abbreviation
adtc
bcr
7+
bc
ac
MultiMediaCard/RS-MultiMediaCard Product Manual
7
x
38
)/G(x)]
3+
Chapter 4 – MultiMediaCard Protocol Description
+…+ (last bit before CRC)*x
1
bit 31….bit 0
argument
Sent on CMD, no response
Sent on CMD, response
Sent on CMD, response on CMD
Sent on CMD, response on CMD, data
transfer on DAT
Definition
bit 6….bit 0
CRC7
3
on CMD
0
04/22/05
end bit
1