Accessing the phyBOARD-Wega Interfaces
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PHYTEC Messtechnik GmbH 2014 L-792e_1
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3.2.2
UART Connectivity (X66 and X69)
The AM335x SOM supports up to 6 so called UART units. On the phyBOARD-Wega the TTL
level signals of UART0 (the standard console), UART2 and UART3 are routed to expansion
connector X69. UART1 is available at pin header connector X66 at RS-232 level.
The Evaluation Board (PEB-EVAL-01) delivered with the kit plugs into the
expansion connector and allows easy use of the standard console (UART0)
which is required for debugging. Please find additional information on the
Evaluation Board in the Application Guide for phyBOARD Expansion Boards
(L-793e).
Further information on the expansion connector can be found in
Pin header connector X66 is located next to the USB host connector (
and
provides the UART1 signals of the AM335x at RS-232 level. The serial interface is intended
to be used as data terminal equipment (DTE) and allows for a 5-wire connection including
the signals RTS and CTS for hardware flow control.
shows the signal mapping of the
RS-232 level signals at connector X66.
Figure 4:
RS-232 Interface Connector (X66)
Pin Signal
Pin Signal
1 NC
2 NC
3 UART1_RXD_RS232
4 UART1_RTS_RS232
5 UART1_TXD_RS232
6 UART1_CTS_RS232
7 NC
8 NC
9 GND
10 NC
Table 8:
Pin Assignment of RS-232 Interface Connector X66
