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AXEL LITE Hardware Manual
SD1_DATA2
SD1_DATA3
SD1_LCTL
SD1_VSELECT
SD1_WP
7.11.2
MMC/SD/SDIO2
The following table describes the interface signals:
SD2_CD
SD2_CLK
SD2_CMD
SD2_DATA0
SD2_DATA1
SD2_DATA2
Pin name
Conn.
J2.101
J2.126
Pin name
Conn.
Function
Pin
J2.79
DATA2 line or Read
Wait in 4-bit
mode
J2.81
DATA3 line in 4/8-bit
mode or
configured as card
detection pin
J2.48
LED control used to
drive an
external LED Active
high
J2.93
IO power voltage
selection signal
Card write protect
J2.46
detect
Function
Pin
J2.36
Card detection pin
J2.71
Clock for
MMC/SD/SDIO card
J2.69
CMD line
J2.61
DATA0 line in all
modes
J2.63
DATA1 line in 4/8-bit
mode
J2.65
DATA2 line or Read
Wait in 4-bit
mode
October, 2016
v. 0.9.5
Notes
Read Wait in 1-bit mode
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
If not used(for the
embedded
memory),tie low to
indicate there is a
card attached.
Also used to detect
busy state
Also used to detect
interrupt in 1/4-
bit mode
Read Wait in 1-bit mode
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