Ucf Location Constraints; Discrete Leds; Locations And Labels - Xilinx MIcroBlaze Development Spartan-3E 1600E Kit User Manual

R
A
B

UCF Location Constraints

Figure 2-9
I/O pin assignment and the I/O standard used, and defines a pull-down resistor on each
input.

Discrete LEDs

Locations and Labels

The MicroBlaze Development Kit board has eight individual surface-mount LEDs located
above the slide switches as shown in
LED0. LED7 is the left-most LED, LED0 the right-most LED.
MicroBlaze Development Kit Spartan-3E 1600 Edition User Guide
UG257 (v1.1) December 5, 2007
Rising edge on 'A'
when 'B' is Low indicates
RIGHT (clockwise) rotation
Rotating RIGHT
Switch closing chatter on 'B'
injects false "clicks" to the LEFT
('B' rising edge when 'A' is Low)
Figure 2-8: Outputs from Rotary Shaft Encoder May Include Mechanical Chatter
provides the UCF constraints for the four push-button switches, including the
NET "ROT_A"
NET "ROT_B"
NET "ROT_CENTER" LOC = "V16" | IOSTANDARD = LVTTL | PULLDOWN ;
Figure 2-9: UCF Constraints for Rotary Push-Button Switch
Switch opening chatter on 'A'
injects false "clicks" to the RIGHT
LOC = "K18" | IOSTANDARD = LVTTL | PULLUP
LOC = "G18" | IOSTANDARD = LVTTL | PULLUP
Figure 2-10. The LEDs are labeled LED7 through
Discrete LEDs
UG257_02_08_060206
;
;
UG257_03_060206
17
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