AF512SDI datasheet(21/81 Pages) ETC1

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ATP Industrial Grade SD Card Specification

1) S: power supply; I: input; O: output using push-pull drivers; PP: I/O using push-pull drivers;

2) The extended DAT Lines (Dat1-DAT3) are input on power up. They start to operate as DAT lines

after SET_BUS_WIDTH command. The Host shall keep its own DAT1-DAT3 lines in input mode,

as well, while they are not used.

3) After power up this line is input with 50Kohm pull-up (can be used for card detection or SPD mode

selection). The pull-up should be disconnected by user, during regular data transfer, with

SET_CLR_CARD_DETECT (ACMD42) command

Each card has a set of information registers. Please refer to chapter 5 for the details of registers.

NAME

WIDT

DESCRIPTION

CID

128

Card identification number; card individual number for identification.

RCA

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

SD Configuration Register; information about the SD Card’s Special

Features capabilities.

OCR

Operation conditions register.

SSR

512

SD Status; information about the card proprietary features.

CSR

Card Status; information about the card status.

Table 4-2: SD Card registers

4.2 SD BUS Topology

The SD Card bus has a single master (application), multiple slaves (cards), synchronous star topology.

Clock, power and ground signals are common to all cards. Command (CMD) and data (DAT0 - DAT3)

signals are dedicated to each card providing continues point to point connection to all the cards.

During initialization process commands are sent to each card individually, allowing the application to

detect the cards and assign logical addresses to the physical slots. Data is always sent (received) to

(from) each card individually. However, in order to simply the handling of the card stack, after the

initialization process, all commands may be sent concurrently to all cards. Addressing information is

provided in the command packet.

SD bus allows dynamic configuration of the number of data lines. After power up, by default, the SD

Card will use only DAT0 for data transfer. After initialization the host can change the bus width

(number of active data lines). This feature allows easy trade off between HW cost and system

performance.

Note that while DAT1-DAT3 are not in use, the related Host’s DAT lines should be in tri-state

(input mode).

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