2.3.1 UART interface
The figure below shows the LS1043ARDB universal asynchronous receiver/transmitter
(UART) connections.
LS1043A
DUART,
DVDD
= 3.3 V
UART2_SIN,
SOUT,
RTS2_B,
CTS2_B
PHY
RS-232
PHY
UART1_SIN,
SOUT
UART
SEL
SW3[3]
CMSIS-DAP
1
0
RTS1_B,
CTS1_B
RS-232
J4
Figure 2-3. UART interface
The LS1043ARDB has two UART connectors; therefore, two UART ports are available
at a time. Two RS-232 transceivers (SP3232) available on the LS1043ARDB help in user
application development and provide convenient communication channels to both
terminal and host computers. The transceivers are connected to the dedicated UART
ports on the LS1043ARDB by 4 wires. They support RTS/CTS flow control.
The table below describes the LS1043ARDB RS-232 interface.
Table 2-2. LS1043ARDB RS-232 interface
UART port Destination Power supply Flow control External connector
UART1 Terminal (host
computer)
3.3 V Supported UART1 (J4 bottom)
UART2 Supported UART2 (J4 top)
2.3.2 eSDHC interface
The LS1043ARDB enhanced secure digital high capacity card (eSDHC) has the
following features:
• x1/x4-bit SD card supporting SD Rev 2.0 and 3.0.
Chapter 2 Interfaces
QorIQ LS1043A Reference Design Board Reference Manual, Rev. 4, 11/2017
NXP Semiconductors 21
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