SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Manual download pdf (Page 28)

Industrial Grade SD Card Interface Description

3.1.2. Pin Assignments in SPI Mode

Table 3-2 lists the pin assignments and definitions in SPI Mode.

Table 3-2. SPI Bus Mode Pad Definition

Pin # Name Type

SPI Description

1 CS I Chip Select (Active low)

2 DataIn I Host to Card Commands and Data

3 VSS1 S Supply Voltage Ground

4 VDD S Supply Voltage

5 CLK I Clock

6 VSS2 S Supply Voltage Ground

7 DataOut O Card to Host Data and Status

8 RSV(2) I Reserved

9 RSV(2) I Reserved

NOTES: 1) S=power supply; I=input; O=output.

2) The ‘RSV’ pins are floating inputs. It is the responsibility of the host designer to connect external pullup resistors to

those lines. Otherwise non-expected high current consumption may occur due to the floating inputs.

Each card has a set of information registers (refer to Table 3-3). Detailed descriptions are provided in Section 3.5.

Table 3-3. Industrial Grade SD Card Registers

Name Width Description

CID 128 Card identification number: individual card number for identification.

RCA

16 Relative card address: local system address of a card, dynamically

suggested by the card and approved by the host during initialization.

CSD 128 Card specific data: information about the card operation conditions.

SCR 64 SD Configuration Register: information about the SD Card’s special

features capabilities.

OCR 32 Operation Condition Register

NOTE: 1) The RCA register is not available in SPI Mode.

The host may reset the cards by switching the power supply off and on again. The card has its own power-on

detection circuitry which puts the card into an idle state after the power-on. The card can also be reset by sending

the GO_IDLE (CMD0) command.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 118 119

No comments

SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Manual Page 28