User's Manual l MBa8Xx UM 0100 l © 2020, TQ-Systems GmbH
Page 23
3.8.3
Debug USB
For the output of debug messages of the TQMa8Xx the MBa8Xx can be connected as USB device via X13 to a host.
A total of four UART interfaces are provided via the USB interface, which are converted to USB with the 4-port bridge FT4232.
Available UART interfaces:
•
UART1 for the Cortex-A35-Core
•
SCU_UART for the SCU
•
2 × UART at pin header X4 (freely usable, e.g. for additional multiplexed UARTs or SCU-UARTs)
The interface is powered from the external USB host, independent of the MBa8Xx supply.
TQMa8Xx
UART1
FT4232
ADBUS
USB
Debug USB
(X13)
SCU_UART
BDBUS
CDBUS
DDBUS
Level
Shifter
Header X4
FTDI_Cxxx
FTDI_Dxxx
Figure 11: Block diagram USB debug