Preliminary User's Manual l TQMa8Xx UM 0002 l © 2018, TQ-Systems GmbH
Page 10
3.2
System components
3.2.1
i.MX 8X CPU
3.2.1.1
i.MX 8X derivatives
Depending on the TQMa8Xx version, one of the following i.MX 8X derivatives is assembled.
Table 5:
i.MX 8X derivatives
TQ-variant
CPU derivative
Cortex™ A35 clock
Cortex™-M4 clock
Tj, temp. range
TQMa8X
D
-xx
i.MX 8DualX
1.2 GHz
266 MHz
–40 °C to +125 °C
TQMa8X
DP
-xx
i.MX 8DualXPlus
1.2 GHz
266 MHz
–40 °C to +125 °C
TQMa8X
QP
-xx
i.MX 8QuadXPlus
1.2 GHz
266 MHz
–40 °C to +125 °C
3.2.1.2
i.MX 8X errata
Attention: Malfunction
Please take note of the current i.MX 8X errata (3).
3.2.1.3
Boot modes
After release of PMIC_POR#, the System Controller (SCU) starts from the internal ROM.
Depending on the OTP fuses (eFuse) and the boot mode settings of the system controller, the TQMa8Xx boots from the specified
boot source:
•
eMMC
•
QSPI-NOR flash
•
SD card
More information about boot interfaces and its configuration is to be taken from the i.MX 8X Data Sheet (1) and the i.MX 8X
Reference Manual (2). Alternatively, an image can be loaded into the internal RAM via serial downloader.
In the following chapters, the configurations for the following possible boot devices are described exemplarily:
Table 6:
Boot-Mode / BT_FUSE_SEL
BOOT_MODE[3:0]
Boot source
0000
Boot from eFuse
0001
Serial Downloader (USB)
0010
Boot from eMMC
0011
Boot from SD card
010x
Boot from NAND
011x
Boot from QSPI
Note: Field software updates
When designing a carrier board, it is recommended to have a redundant update concept for field
software updates.
