Hardware Reference
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. Figure3-1 shows the architecture of the

UART interface.

Figure3-1 Serial interface

The signals associated with the UART interface are assigned to the EXPIM socket pins

as shown in Table3-1.

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
Table3-1 Serial interface signal assignment
Signal name EXPIM
connector Description
UART_TX D IM_BBANK41 Transmit data
UART_RT S IM_BBANK42 Ready to send
UART_DT R IM_BBANK43 Data terminal ready
UART_RXD IM_BBANK44 Receive data
UART_DCD IM_BBANK45 Data carrier detect
UART_DS R IM_BBANK46 Data set ready
UART_CT S IM_BBANK47 Clear to send
UART_RI IM_BBANK48 Ring indicator