User's Manual l TQMa335xL UM 0101 l © 2019, TQ-Systems GmbH
Page 10
3.2.1.4
Boot interfaces
The configuration of the following boot devices is described in the next sections:
•
MMC0 (external SD card)
•
MMC1 (eMMC on TQMa335xL)
•
SPI0 NOR flash (not available on TQMa335xL)
Attention: Destruction or malfunction
Many AM335x pins can be configured as different function.
Please pay attention to the notes in the AM335x Data Sheet (1) concerning the wiring of these pins
before integration / start-up of your carrier board / Starterkit.
Please also take note of the latest AM335x errata (7).
3.2.1.4.1
Boot device SD card
The SD card boots from MMC0 of the AM335x. The following pins must be used for the boot process.
Table 7:
Pins used for SD card boot
TQMa335xL pad
Signal
Pad
Dir.
AM335x ball
Remark
F17
MMC0_CLK
MMC0_CLK
I/O
G17
–
F15
MMC0_CMD
MMC0_CMD
I/O
G18
–
E14
MMC0_DAT3
MMC0_DAT3
I/O
F17
–
E15
MMC0_DAT2
MMC0_DAT2
I/O
F18
–
E16
MMC0_DAT1
MMC0_DAT1
I/O
G15
–
E17
MMC0_DAT0
MMC0_DAT0
I/O
G16
–
3.2.1.4.2
Boot device eMMC
The eMMC boots from MMC1 of the AM335x. MMC1 supports eMMCs with a size of 4 Gbyte or greater.
The following pins are used for the boot process.
Table 8:
Pins used for eMMC boot
TQMa335xL pad
Signal
Pad
Dir.
AM335x ball
Remark
P3
MMC1_CLK
GPMC_CS#1
I/O
U9
–
R3
MMC1_CMD
GPMC_CS#2
I/O
V9
–
M2
MMC1_DAT3
GPMC_AD3
I/O
T8
4-bit boot
L4
MMC1_DAT2
GPMC_AD2
I/O
R8
L3
MMC1_DAT1
GPMC_AD1
I/O
V7
L2
MMC1_DAT0
GPMC_AD0
I/O
U7