122 www.xilinx.com Spartan-3E Starter Kit Board User Guide
UG230 (v1.0) March 9, 2006
Chapter 15:
Expansion Connectors
R
Header J4
The J4 header, shown in Figure 15-10, is located immediately to the left of the J1 header. It
uses a 6-pin header consisting of 0.1-inch centered stake pins. Four FPGA pins connect to
the J4 header, FX2_IO<12:9>. These four signals are also shared with the Hirose FX2
connector. The board supplies 3.3V to the accessory board mounted in the J4 socket on the
bottom pin.
UCF Location Constraints
Figure 15-11 provides the User Constraint File (UCF) constraints for accessory headers,
including the I/O pin assignment and the I/O standard used. These header connections
are shared with the FX2 connector, as shown in Figure 15-7, page 120.
Figure 15-10:
FPGA Connections to the J4 Accessory Header
J4
(D7)
FX2_IO9
(C7)
FX2_IO10
(F8)
(E8)
Spartan-3E FPGA
GND
3.3V
FX2_IO11
FX2_IO12
UG230_c12_09_022406
Figure 15-11:
UCF Location Constraints for Accessory Headers
# ==== 6-pin header J1 ====
# These four connections are shared with the FX2 connector
#NET "J1<0>" LOC = "B4" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
#NET "J1<1>" LOC = "A4" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
#NET "J1<2>" LOC = "D5" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
#NET "J1<3>" LOC = "C5" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
# ==== 6-pin header J2 ====
# These four connections are shared with the FX2 connector
#NET "J2<0>" LOC = "A6" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
#NET "J2<1>" LOC = "B6" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
#NET "J2<2>" LOC = "E7" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
#NET "J2<3>" LOC = "F7" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
# ==== 6-pin header J4 ====
# These four connections are shared with the FX2 connector
#NET "J4<0>" LOC = "D7" | IOSTANDARD = LVTTL | SLEW
= SLOW | DRIVE = 6 ;
#NET "J4<1>" LOC = "C7" | IOSTANDARD = LVTTL | S
LEW = SLOW | DRIVE = 6 ;
#NET "J4<2>" LOC = "F8" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
#NET "J4<3>" LOC = "E8" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 6 ;
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