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UART interface

The Juno Arm® Development Platform SoC provides a dual-port UART interface.

The UART 0 transceiver can connect to one of the following:

  • The MCC.
  • The UART 0 interface on the Juno SoC.

The UART 1 transceiver can connect to one of the following:

  • The Daughterboard Configuration Controller on the LogicTile daughterboard.
  • The UART 1 interface on the Juno SoC.
  • The MCC.

Variables MBLOG and DBLOG in the config.txt file define the connections of the UART transceivers.

The MBLOG options are:

  • FALSE:
    • MCC not connected. The Juno SoC UART 0 interface connects to the UART 0 transceiver.
  • UART0:
    • The MCC connects to the UART 0 transceiver.
  • UART1:
    • The MCC connects to the UART 1 transceiver.

The DBLOG options are:

  • FALSE:
    • Daughterboard Configuration Controller not connected. The Juno SoC UART 1 interface connects to the UART 1 transceiver.
  • UART1:
    • The Daughterboard Configuration Controller connects to the UART 1 transceiver.

Note

If you set option UART1 for both MBLOG and DBLOG, MBLOG overrides DBLOG and the UART 1 transceiver connects to the MCC, UART 0 transceiver connects to the UART 0 interface on the Juno SoC, and the Daughterboard Configuration Controller is not connected.

The default connection of the UART 0 transceiver is to the MCC at powerup and then it switches to the Juno SoC UART 0 interface.

The default connection of the UART 1 transceiver is to the Daughterboard Configuration Controller at powerup and then it switches to the Juno SoC UART 1 interface.

The following figure shows the UART interface to the V2M‑Juno motherboard.

Figure 2-15 V2M‑Juno motherboard UART interface


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