2.13
UART interface
The Juno r2 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 r2 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 r2 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 r2 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 r2 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 r2 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 r2 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 r2 SoC UART 1 interface.
The following figure shows the UART interface to the V2M-Juno r2 motherboard.
2 Hardware Description
2.13 UART interface
ARM 100114_0200_03_en
Copyright © 2015–2017 ARM Limited or its affiliates. All rights reserved.
2-52
Non-Confidential