Altera Nios Development Board Cyclone II Edition - Manual (Page 28)

2–16 Reference Manual Altera Corporation
Nios Development Board Cyclone II Edition May 2007
Board Components
Figure 2–5. Serial Connector J19
Expansion
Prototype
Connectors
(PROTO1 &
PROTO2) PROTO1 and PROTO2 are standard-footprint, mechanically-stable
connections that can be used (for example) as an interface to a special-
function daughter card. Headers J11, J12, and J13
collectively form
PROTO1, and J15, J16 and J17 collectively form PROTO2.
The expansion prototype connector interface includes:
■ 41 I/O pins for prototyping. All 41 I/O pins connect to user I/O pins
on the FPGA. Each signal passes through analog switches to protect
the FPGA from 5V logic levels. These analog switches are
permanently enabled. The output logic-level on the expansion
prototype connector pins is 3.3V.
● PROTO1 switches: U19, U20, U21, U22 and U25
● PROTO2 switches: U27, U28, U29, U30 and U31
Table 2–10. Serial Connector Pin Table
FPGA Pin J19 Pin Board Net Name
AB15 3 serial_rxd
J22 2 serial_txd
H21 4 serial_dtr
K22 1 serial_dcd
H19 6 serial_dsr
L19 9 serial_ri
L23 8 serial_cts
AC15 7 serial_rts
Function
Direction
Connector Pin #
Connector Pin #
Direction
Function
GND
5
DTR
IN
4
RXD
IN
3
TXD
OUT
2
DCD
OUT
1
9
OUT
RI
8
OUT
CTS
7
IN
RTS
6
OUT
DSR
J19