User's Manual l MBa335x UM 0202 l © 2018, TQ-Systems GmbH
Page 35
4.2.10
SD card
The SD card slot is directly connected to the MMC0 interface of the TQMa335x.
An optional resistor is integrated in series in the clock line to adjust the line attenuation.
Illustration 31:
Block diagram SD card slot, X10
It is possible to boot from SD card (see section 4.3.5).
The read and write speeds of the SD card interface depend on the SD card used.
The maximum available data rate is to be taken from the respective CPU Reference Manual.
Attention:
The signals WP and CD# are not routed to the SD card connector by default. This may cause
transmission errors and it is recommended to assemble R402 and R405 in such a case to use these
signals at the SD card interface. In this case the UART3 interface is not available.
Illustration 32:
Position of SD card slot, X10
Table 64:
SD card connector
Manufacturer / Number
Description
Yamaichi / FPS009-2405-0
SD/MMC card connector
Table 65:
Pinout SD card, X10
Pin
Pin name
Signal
Dir.
Remark
1
CD/DAT3/CS
MMC0.DAT3
I/O
2
CMD/DI
MMC0.CMD
I/O
10 kΩ to VCC3V3
3
VSS1
DGND
P
4
VDD
VCC3V3
P
110 µF to DGND
5
CLK
MMC0.CLK_R
O
0 Ω in series
6
VSS2
DGND
P
7
DAT0/DO
MMC0.DAT0
I/O
8
DAT1
MMC0.DAT1
I/O
9
DAT2
MMC0.DAT2
I/O
CDS
CARD_DETECT
MMC0.CD#
I
10 kΩ to VCC3V3
COM
COMMON
DGND
P
WP
WRITE_PROTECT
MMC0.WP
I
10 kΩ to VCC3V3
M1-2
DGND
DGND
P