SLSD512BSIU STEC, SLSD512BSIU Datasheet - Page 14

• Manufacturer Part Number: SLSD512BSIU
• Manufacturer: STEC
• Type: SD Cardr

Specifications of SLSD512BSIU

• Density: 512MByte
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Package Type: Not Required
• Pin Count: 9
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Programmable: Yes
• Lead Free Status / Rohs Status: Compliant

SLSDxxxBS(I)U
4.2
The card supports SD and the SPI Bus modes. Application can chose either one of the modes. Mode
selection is transparent to the host. The card automatically detects the mode of the reset command and
will expect all further communication to be in the same communication mode. The SD mode uses a 4-bit
high performance data transfer, and the SPI mode provides compatible interface to MMC host systems
with little redesign, but with a lower performance.
4.2.1 SD Bus Mode Protocol
The SD Bus mode has a single master (host) and multiple slaves (cards) synchronous topology. Clock,
power, and ground signals are common to all cards. After power up, the SD Bus mode uses DAT0 only;
after initialization, the host can change the cards’ bus width from 1 bit (DAT0) to 4 bits (DAT0-DAT3). In
high speed mode, only one card can be connected to the bus.
Communication over the SD bus is based on command and data bit streams which are initiated by a start
bit and terminated by a stop bit.
The SD bus signals are listed in Table 14 and the SD bus topology is illustrated in Figure 8.
Command: a command is a token which starts an operation. A command is sent from the host either
to a single card (addressed command) or to all connected cards (broadcast command). A command is
transferred serially on the CMD line.
Response: a response is a token which is sent from an addressed card, or (synchronously) from all
connected cards, to the host as an answer to a previously received command. A response is
transferred serially on the CMD line.
Data: data can be transferred from the card to the host or vice versa. Data is transferred via the data
lines.
SD and SPI Bus Modes
DAT0-DAT3
Vdd, Vss
Signal
CMD
CLK
61000-05203-107, March 2008
Table 14: SD Bus Signals
Bidirectional Command/Response signal
4 Bidirectional data signals
Host to card clock signal
Power and Ground
Description
Industrial Grade SD Card Datasheet
14