NXP Semiconductors QorIQ LX2160A - Page 46

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 2-20. 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.
UART interface
QorIQ LX2160A Reference Design Board Reference Manual, Rev. 0, 09/2018
46 NXP Semiconductors