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AXEL LITE Hardware Manual
SD2_DATA3
SD2_LCTL
SD2_VSELECT
SD2_WP
7.11.3
MMC/SD/SDIO3
The following table describes the interface signals:
SD3_CLK
SD3_CMD
SD3_DATA0
SD3_DATA1
SD3_DATA2
SD3_DATA3
SD3_DATA4
Pin name
Conn.
Pin name
Conn.
Function
Pin
J2.67
DATA3 line in 4/8-bit
mode or
configured as card
detection pin
J2.40
LED control used to
drive an
external LED Active
high
J2.95
IO power voltage
J2.99
selection signal
J2.32
Card write protect
detect
Function
Pin
J2.59
Clock for
MMC/SD/SDIO card
J2.55
CMD line
J2.39
DATA0 line in all
modes
J2.41
DATA1 line in 4/8-bit
mode
J2.43
DATA2 line or Read
Wait in 4-bit
mode
J2.45
DATA3 line in 4/8-bit
mode or
configured as card
detection pin
J2.47
DATA4 line in 8-bit
mode, not used
in other modes
October, 2016
v. 0.9.5
Notes
May be configured as
card detection
pin in 1-bit mode
Fully controlled by the
driver
Optional output
If not used(for the
embedded
memory), tie low to
indicate it's not
write protected.
Notes
Also used to detect
busy state
Also used to detect
interrupt in 1/4-
bit mode
Read Wait in 1-bit mode
May be configured as
card detection
pin in 1-bit mode
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