Product manual

Industrial Grade SD Card Interface Description

Table 3-26. SD Supported Security Algorithm

SD_SECURITY Supported Algorithm

0 No security

1 Security protocol 1.0

Security Spec Ver 0.96

2 Security protocol 2.0

Security Spec Ver 1.0-1.01

3 .. 7 Reserved

NOTE: It is mandatory for a Writable Industrial Grade SD Card (OTP or R/W) to support Security Protocol.

SD_BUS_WIDTHS—Describes all the DAT bus widths that are supported by this card.

Table 3-27. Industrial Grade SD Card Supported Bus Widths

SD_BUS_WIDTHS Supported Bus Widths

Bit 0 1 bit (DAT0)

Bit 1 Reserved

Bit 2 4 bit (DAT0-3)

Bit 3 [MSB] Reserved

SD cards will set at least bits 0 and 2 (SD_BUS_WIDTH=0101), because the cards must support at least two bus

modes of either 1-bit or 4-bit width.

3.5.5. Status Register

The Industrial Grade SD Card supports the following two card status fields:

• Card Status—This status field is compatible to the MultiMediaCard protocol.

• SD_Status—This extended status field of 512 bits supports special features unique to the SD Card and

future application specific features.

The Industrial Grade SD Card status registers’ structures are defined in Table 3-28. The Type and Clear-Condition

fields in the table are coded as follows:

Type:

• E—Error bit.

• S—Status bit.

• R—Detected and set for the actual command response.

• X—Detected and set during command execution. The host must poll the card by sending status

command in order to read these bits.

Clear Condition:

• A—According to the card current state.

• B—Always related to the previous command. Reception of a valid command will clear it (with a delay

of one command).

• C—Clear by read.