User guide
Nexys2 Reference Manual
Digilent
www.digilentinc.com
Copyright Digilent, Inc. Page 16/17 Doc: 502-134
Expansion connector
The Nexys2 board includes a Hirose FX-2 high-
density 100 pin connector that is suitable for
driving peripheral boards with signal rates in
excess of 100 MHz. Many connector signals are
routed to the FPGA as differential pairs, and 47
connector pins are tied to ground, resulting in a
very low-noise connection system. The self-
aligning Hirose FX-2 connector can be used for
board-to-board connections or board-to-cable
connections using the mating Hirose FX2-100S-
1.27 available from many catalog distributors
and directly from Digilent.
All signals routed from the FPGA to the FX-2
connector include 75-ohm series resistors. The
table on the right shows all signal connections
between the FX-2 connector and the FPGA.
Signals without corresponding entries in the
FPGA column are not directly connected to the
FPGA.
Table 4: Hirose FX2 Connector Pin Assignments
J1A Name FPGA J1B Name FPGA
1
VCC3V3
1 SHIELD
2 VCC3V3 2 GND
3 TMS D15 3 TDO-ROM
4 JTSEL 4 TCK A17
5 TDO-FX2 5 GND
6 FX2-IO1 B4 6 GND
7 FX2-IO2 A4 7 GND
8 FX2-IO3 C3 8 GND
9 FX2-IO4 C4 9 GND
10 FX2-IO5 B6 10 GND
11 FX2-IO6 D5 11 GND
12 FX2-IO7 C5 12 GND
13 FX2-IO8 F7 13 GND
14 FX2-IO9 E7 14 GND
15 FX2-IO10 A6 15 GND
16 FX2-IO11 C7 16 GND
17 FX2-IO12 F8 17 GND
18 FX2-IO13 D7 18 GND
19 FX2-IO14 E8 19 GND
20 FX2-IO15 E9 20 GND
21 FX2-IO16 C9 21 GND
22 FX2-IO17 A8 22 GND
23 FX2-IO18 G9 23 GND
24 FX2-IO19 F9 24 GND
25 FX2-IO20 D10 25 GND
26 FX2-IO21 A10 26 GND
27 FX2-IO22 B10 27 GND
28 FX2-IO23 A11 28 GND
29 FX2-IO24 D11 29 GND
30 FX2-IO25 E10 30 GND
31 FX2-IO26 B11 31 GND
32 FX2-IO27 C11 32 GND
33 FX2-IO28 E11 33 GND
34 FX2-IO29 F11 34 GND
35 FX2-IO30 E12 35 GND
36 FX2-IO31 F12 36 GND
37 FX2-IO32 A13 37 GND
38 FX2-IO33 B13 38 GND
39 FX2-IO34 E13 39 GND
40 FX2-IO35 A14 40 GND
41 FX2-IO36 C14 41 GND
42 FX2-IO37 D14 42 GND
43 FX2-IO38 B14 43 GND
44 FX2-IO39 A16 44 GND
45 FX2-IO40 B16 45 GND
46 GND 46 FX2-CLKIN B9
47 FX2-CLKOUT D9 47 GND
48 GND 48 FX2-CLKIO M9
49 VCCFX2 49 VCCFX2
50 VCCFX2 50 SHIELD