SQFlash
Industrial Class 10 Micro SD Card
Specifications subject to change without notice, contact your sales representatives for the most update information.
REV 0.3 Page 10 of 22 May. 4, 2016
5. Pin Assignment and Block Diagram
pin
SD Mode SPI Mode
Name Type
1
Description Name Type Description
1 DAT2 I/O/PP Data Line[bit2] RSV
2 CD/DAT3
2
I/O/PP
3
Card Detect/
Data Line[bit3]
CS I
3
Chip Select (neg
true)
3 CMD PP Command/Response DI I Data In
4 V
DD
S Supply voltage V
DD
S Supply voltage
5 CLK I Clock SCLK I Clock
6 V
SS
S Supply voltage ground V
SS
S
Supply voltage
ground
7 DAT0 I/O/PP Data Line[bit0] DO O/PP Data Out
8 DAT1 I/O/PP Data Line[bit1] RSV
(1) S: power supply, I: input; O: output using push-pull drivers; PP:I/O using push-pull driver
(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. It is defined so, in order to keep compatibility to MultiMedia Cards.
(3) At power up this line has a 50KOhm pull up enabled in the card. This resistor serves two functions Card
detection and Mode Selection. For Mode Selection, the host can drive the line high or let it be pulled
high to select SD mode. If the host wants to select SPI mode it should drive the line low. For Card
detection, the host detects that the line is pulled high. This pull-up should be disconnected by the user
during regular data transfer period, with SET_CLR_CARD_DETECT (ACMD42) command.
Name Width Description
CID 128bit
Card identification number; card individual number for identification.
Mandatory
RCA
1
16bit
Relative card address; local system address of a card, dynamically
suggested by the card and approved by the host during initialization.
Mandatory
DSR 16bit Driver Stage Register; to configure the card’s output drivers. Optional
CSD 128bit
Card Specific Data; information about the card operation conditions.
Mandatory
SCR 64bit
SD Configuration Register; information about the SD Memory Card's Special
Features capabilities Mandatory
OCR 32bit Operation conditions register. Mandatory.
SSR 512bit
SD Status; information about the card proprietary features
Mandatory
OCR 32bit
Card Status; information about the card status
Mandatory