Operation; Ucf Location Constraints; Related Resources - Xilinx Spartan-3E User Manual

Chapter 2: Switches, Buttons, and Knob

Operation

Each LED has one side connected to ground and the other side connected to a pin on the
Spartan-3E device via a 390Ω current limiting resistor. To light an individual LED, drive
the associated FPGA control signal High.

UCF Location Constraints

Figure 2-11
I/O pin assignment, the I/O standard used, the output slew rate, and the output drive
current.

Related Resources

•
20
provides the UCF constraints for the four push-button switches, including the
NET "LED<7>" LOC = "F9" |
NET "LED<6>" LOC = "E9" |
NET "LED<5>" LOC = "D11" |
NET "LED<4>" LOC = "C11" |
NET "LED<3>" LOC = "F11" |
NET "LED<2>" LOC = "E11" |
NET "LED<1>" LOC = "E12" |
NET "LED<0>" LOC = "F12" |
Figure 2-11: UCF Constraints for Eight Discrete LEDs
Rotary Encoder Interface for Spartan-3E Starter Kit (Reference Design)
http://www.xilinx.com/s3estarter
www.xilinx.com
IOSTANDARD = LVTTL | SLEW
IOSTANDARD = LVTTL | SLEW
IOSTANDARD = LVTTL |
IOSTANDARD = LVTTL |
IOSTANDARD = LVTTL |
IOSTANDARD = LVTTL |
IOSTANDARD = LVTTL |
IOSTANDARD = LVTTL |
Spartan-3E Starter Kit Board User Guide
= SLOW | DRIVE = 8 ;
= SLOW | DRIVE = 8 ;
SLEW = SLOW | DRIVE = 8 ;
SLEW = SLOW | DRIVE = 8 ;
SLEW = SLOW | DRIVE = 8 ;
SLEW = SLOW | DRIVE = 8 ;
SLEW = SLOW | DRIVE = 8 ;
SLEW = SLOW | DRIVE = 8 ;
UG230 (v1.0) March 9, 2006
R