OMAP4460 Pandaboard ES
System Reference Manual
Revision 0.1
September 29, 2011
DOC-21054
Page 28 of 82
2.10
Debug UART Interface
A single RS-232 port is provided on the Pandaboard ES via 9-pin D-sub female connector at location P4.
It provides access to the UART3 interface of the OMAP4460. See Figure 5 for the implementation of the
RS232 port.
The TXS0104EZXUR device at U20 is a voltage translator that translates between the 1.8V logic levels
required by the OMAP4460 processor to the 3.3V logic levels required by the SN75C3232EDR. The
SN75C3232EDR @ U23 is an RS-232 transceiver that converts the 3.3V logic signals to/from the voltage
translator to the RS-232 signal levels required (-5V to +5V).
The UART port at P4 can be accessed by using Teraterm or other terminal emulation program. To use
this UART interface, the serial port settings should be applied as follows:
BAUD RATE: 115200
DATA: 8 bit
PARITY: none
STOP: 1bit
FLOW CONTROL: none
This port requires the use of a 9-pin D-sub Male to Female cable.
Figure 5 – Panda UART3/RS-232 Block Diagram
2.11
SD/MMC Connector
The OMAP4460 Pandaboard ES supports removable memory storage via onboard SD/MMC card cage.
It is an eight-bit card cage that supports 1.8V or 3.0V cards. Card detect functionality is supported via the
TWL6030 power companion IC. See Figure 6 for a block diagram of the interface signaling to the card
cage. The resistors shown in Figure 6 below are 33 ohm series termination resistors.
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