SLSDM256BU STEC, SLSDM256BU Datasheet - Page 17

• Manufacturer Part Number: SLSDM256BU
• Manufacturer: STEC
• Type: MicroSD Cardr

Specifications of SLSDM256BU

• Density: 256MByte
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Package Type: Not Required
• Pin Count: 8
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Programmable: Yes
• Lead Free Status / RoHS Status: Compliant

SLSDMxxxB(I)U
Industrial Grade microSD Card Datasheet
Figure 8: SPI Bus Topology
4.2.3 Mode Selection
The SD Memory Card wakes up in the SD mode. It will enter SPI mode if the CS signal is asserted
(negative) during the reception of the reset command (CMD0) and the card is in idle_state. If the card
recognizes that the SD mode is required it will not respond to the command and remain in the SD mode.
If SPI mode is required the card will switch to SPI and respond with the SPI mode R1 response.
The only way to return to the SD mode is by entering the power cycle. In SPI mode the SD Memory Card
protocol state machine is not observed. All the SD Memory Card commands supported in SPI mode are
always available.
During the initialization sequence, if the host gets Illegal Command indication for ACMD41 sent to the
card, it may assume that the card is MultiMediaCard. In that case it should re-start the card as
MultiMediaCard using CMD0 and CMD1.
61000-04581-104, July 2007
17