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ARM DUI 0163B Copyright © 2001-2003. All rights reserved. 3-3
3.2 UART interface
The interface module provides one serial transceiver suitable for use with the PrimeCell
UART (PL011) or other similar peripheral. Figure 3-1 shows the architecture of the
UART interface.
Figure 3-1 Serial interface
The signals associated with the UART interface are assigned to the EXPIM socket pins
as shown in Table 3-1.
EXPIM Socket
MAX3243E
RS232
Transceiver
(U22)
UART_TXD
J18
UART_RTS
UART_DTR
UART_RXD
UART_DCD
UART_DSR
UART_CTS
UART_RI
SER_TXD
SER_RTS
SER_DTR
SER_RXD
SER_DCD
SER_DSR
SER_CTS
SER_RI
Table 3-1 Serial interface signal assignment
Signal name
EXPIM
connector
Description
UART_TXD IM_BBANK41 Transmit data
UART_RTS IM_BBANK42 Ready to send
UART_DTR IM_BBANK43 Data terminal ready
UART_RXD IM_BBANK44 Receive data
UART_DCD IM_BBANK45 Data carrier detect
UART_DSR IM_BBANK46 Data set ready
UART_CTS IM_BBANK47 Clear to send
UART_RI IM_BBANK48 Ring indicator