EP2S180 Datasheet, PDF (52/58 Pages) Altera Corporation – DSP Development Board

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
Function
GND DTR1 RXD1 TXD1 DCD1
Direction
IN IN OUT OUT
Stratix II Pin #
K13 L16 L17 H14
Connector Pin # 5
4
3
2
1
J19
Connector Pin #
9876
StratixII Pin #
K17 K15 L15 K16
Direction
OUT OUT IN OUT
Function
RI1 CTS1 RTS1 DSR1
Table 2–36 shows the pin-outs for the RS-232C interface.
Table 2–36. RS-232C Serial Interface Pin-
Outs
Signal
TXD
RXD
DTR
DCD
DSR
RI
CTS
RTS
Stratix II Pin
L17
L16
K13
H14
K16
K17
K15
L15
2–44
Core Version a.b.c variable
Stratix II EP2S180 DSP Development Board Reference Manual
Altera Corporation