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A x e l H a r d w a r e M a n u a l
v . 1 . 0 . 4
7.12.4 MMC/SD/SDIO4
The following table describes the interface signals:
Pin name
Conn.
Pin
Function
Notes
SD4_CLK
J2.28
Clock for
MMC/SD/SDIO
card
SD4_CMD
J2.34
CMD line
SD4_DATA0
J2.32
DATA0 line in all
modes
Also used to detect
busy state
SD4_DATA1
J2.44
DATA1 line in
4/8-bit mode
Also used to detect
interrupt in 1/4-
bit mode
SD4_DATA2
J2.46
DATA2 line or
Read Wait in 4-bit
mode
Read Wait in 1-bit
mode
SD4_DATA3
J2.48
DATA3 line in
4/8-bit mode or
configured as
card detection pin
May be configured as
card detection
pin in 1-bit mode
SD4_DATA4
J2.52
DATA4 line in
8-bit mode, not
used
in other modes
SD4_DATA5
J2.54
DATA5 line in
8-bit mode, not
used
in other modes
SD4_DATA6
J2.56
DATA6 line in
8-bit mode, not
used
in other modes
SD4_DATA7
J2.58
DATA7 line in
8-bit mode, not
used
in other modes
SD4_RESET
J2.36
Card hardware
reset signal,
active
LOW
SD4_VSELECT
J2.4
IO power voltage
April, 2015
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