OMAP
TM
4 PandaBoard System
Reference Manual
Revision 0.4
September 22, 2010
DOC-21010
Page 27 of 83
•
PARITY: none
•
STOP: 1bit
•
FLOW CONTROL: none
This port requires the use of a 9-pin D-sub Male to Female null-modem cable.
UART3_CTS_RCTX/GPIO_141
I
UART3_RTS_SD/GPIO_142
O
UART3_RX_IRRX/GPIO_143
I
UART3_TX_IRTX/GPIO_144
O
TXS0104EZXUR
(U21)
A3
A2
I
O
A1
O
A4
I
B1
I
B2
O
B3
I
B4
O
ROUT1
DIN2
I
O
ROUT2
O
DIN1
I
RIN2
I
DOUT2
O
RIN1
I
DOUT1
O
RXD
RTS
8
3
CTS
7
TXD
2
DTR
4
DSR
6
Figure 5 – Panda UART3/RS-232 Block Diagram
2.10
SD/MMC Connector
The OMAP4430 PandaBoard 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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