Serial
Interfaces
©
PHYTEC Messtechnik GmbH 2010 L-750e_1
45
Caution:
The signal level of some of the serial interfaces is VDD_3V3_IN,
which is 3.3V and therefore identical with the voltage level of the
primary supply voltage of the phyCARD-M. Therefore special
precautions are not necessary when connecting to these interfaces.
Nonetheless if you want to keep your application compatible with
other phyCARDs and thus being able to change your application's
processing power, level shifters supplied with the output voltage at
pins X2A5 and X2B5 at one of the supply rails should be used when
connecting these interfaces to external devices. Unlike on the
phyCARD-M the voltage level of interface signals is different from
the primary supply voltage on other phyCARDs. Please pay special
attention to the Signal Level (SL) column in the following tables.
Please refer to the phyCARD Design-In Guide for more information
about using the serial interfaces of the phyCARD-M in customer
applications.
9.1
Universal Asynchronous Interface
The phyCARD-M provides a high speed universal asynchronous
interface with up to 4 Mbit/s and hardware flow control (RTS and
CTS signals). The following table shows the location of the signals on
the phyCARD- Connector.
P
IN
#
S
IGNAL
I/O
SL
D
ESCRIPTION
X2A39 X_UART1_T
XD
O
VDD_3V3_I
N
Serial transmit signal UART 1
X2A40 X_UART1_R
TS
O
VDD_3V3_I
N
Request to send UART 1
X2B39 X_UART1_R
XD
I
VDD_3V3_I
N
Serial data receive signal
UART 1
X2B40 X_UART1_C
TS
I
VDD_3V3_I
N
Clear to send UART 1
Table 14:
Location of the UART signals