UART1_SIN,
UART1_SOUT,
UART1_RTS_B (UART3_SIN),
UART1_CTS_B (UART3_SOUT)
RS232
XCVR
LTC2804-1
UART1
(bottom)
UART2
(top)
RS232
XCVR
LTC2804-1
OVDD
OVDD
OVDD (1.8 V)
LX2160A
UART2_SIN,
UART2_SOUT,
UART2_RTS_B (UART4_SIN),
UART2_CTS_B (UART4_SOUT)
NORCOMP
178-009-613R571
or equivalent
Dual-stack DB9 male
Figure 22. UART architecture
2.11.1 Quad serial port support
The serial ports support converting each 4-wire serial port into two independent 2-wire serial ports (for a total of four). When
enabled, the UART1_RTS_B/UART2_RTS_B signal becomes UART3_SIN/UART4_SIN and the UART1_CTS_B/UART2_CTS_B
signal becomes UART3_SOUT/UART4_SOUT. To evaluate UART3 and/or UART4, a custom DB9 interface cable must be
created, as shown in the following figure.
Figure 23. 4-wire to 2-wire UART adapter
NXP Semiconductors
LX2160ARDB Functional Description
QorIQ LX2160A Reference Design Board Reference Manual, Rev. 4, 07/2020
Reference Manual 37 / 116
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