Altera Stratix II EP2S180 DSP Development Board - Manual (Page 52)

2–44 Core Version a.b.c variable Altera Corporation
Stratix II EP2S180 DSP Development Board Reference Manual
Expansion Interfaces
J29 is a standard DB-9 serial connector. This connector is typically used
for communication with a host computer using a standard 9-pin serial
cable connected to (for example) a COM port. Level-shifting buffers (U52
and U58) are used between J29 and the Stratix II device, because the
Stratix II device cannot interface to RS-232 voltage levels directly.
J29 is able to transmit all RS-232 signals. The Stratix II design may use
only the signals it needs, such as J29’s RXD and TXD. LEDs are connected
to the RXD and TXD signals, giving a visual indication when data is being
transmitted or received.
Figure 2–9 shows the pin connections between
the serial connector and the Stratix II device.
Figure 2–9. Serial Connector J29
Table 2–36 shows the pin-outs for the RS-232C interface.
Table 2–36. RS-232C Serial Interface Pin-
Outs
Signal Stratix II Pin
TXD L17
RXD L16
DTR K13
DCD H14
DSR K16
RI K17
CTS K15
RTS L15
Function
Direction
Stratix II Pin #
Connector Pin #
Connector Pin #
StratixII Pin #
Direction
Function
GND
5
DTR1
IN
K13
4
RXD1
IN
L16
3
TXD1
OUT
L17
2
DCD1
OUT
H14
1
9
K17
OUT
RI1
8
K15
OUT
CTS1
7
L15
IN
RTS1
6
K16
OUT
DSR1
J19