SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 83

• 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
5.23.1
5.22
5.23
Card Registers
SPI Bus Timing Diagrams
Command and Response
In SPI Mode, only the OCR, CSD and CID registers are accessible. Although the registers’
format is identical to those in MultiMediaCard Mode, a few fields are irrelevant in SPI
Mode.
All timing diagrams use the schematics and abbreviations listed in Table 5-10.
Table 5-10
The host must keep the clock running for at least N
received. This restriction applies to command and data response tokens.
This section provides valuable information on commands and responses.
Host Command to Card Response—Card is Ready
Figure 5-20 describes the basic command response (no data) in an SPI transaction.
Figure 5-20
Host Command to Card Response--Card is Busy
The timing diagram in Figure 5-21 illustrates the command response transaction for
commands when the card response is of type R1b—for example, SET_WRITE_PROT and
ERASE.
When the card is signaling busy, the host may de-select it by raising the CS at any time.
The card will release the DataOut line one clock after CS goes high. To check if the card is
still busy, it needs to be re-selected by asserting the CS signal (set to low). The card will
resume the busy signal, pulling DataOut low, one clock after the falling edge of CS.
CS
DataIn
DataOut
H
L
X
Z
*
Busy
Command
Response
Data block
Symbol
H
X
Z
H
X
Z
L
H
Z
N
L
H
H
CS
Signal is high (logical 1)
Signal is low (logical 0)
Don’t care (undefined value)
High impedance state (-> = 1)
Repeater
Busy token
Command token
Response token
Data token
L
H
H
H
H H
SPI Bus Timing Abbreviations
Host Command to Card Response—Card is Ready
6 Bytes Command
*************
H
5-18
H H H
H H H
N
CR
*******************
H
H
MultiMediaCard/RS-MultiMediaCard Product Manual
H
Definition
CR
1 or 2 Bytes Response
clock cycles after the card response is
*******************
Chapter 5 –SPI Mode
L
H
H
N
L
H
H
EC
L
H
H
L
H
H H H
H
X
H
X
04/21/05
H
X
Z
H
X
Z