ATF15xx-DK3-U Development/Programmer Kit [USER GUIDE]
Atmel-8961A-CPLD-ATF15xx-DK3-U-Development-Kit-UserGuide_072015
8
Push-button Switches with Selectable Jumpers for I/O Pins
The CPLD Development/Programmer Board contains eight push-button switches, which are
connected to the I/O pins of the CPLD. The switches send input logic signals to the user I/O pins of the
ATF15xx device. These switches are labeled SW1 to SW8 on the CPLD Development/Programmer
Board. One end of each input push-button switch is connected to V
CC
IO, while the other end of each
push-button switch is connected to a pull-down resistor and then connected to the specific I/O pin of
the CPLD through the JPS1/2/3/4/5/6/7/8 selectable jumper.
If any one of these switches is pressed and the corresponding jumper is set, the specific I/O pin of the
device will be driven to a logic high state by the output of switch circuit. Since each push-button switch
is also connected to a pull-down resistor, the input will have a logic low state if the switch is not pressed
with the corresponding jumper set. If the push-button jumper is not set, the corresponding pin will be
treated as an unconnected pin.
Figure 4
is a circuit diagram of the push-button switch and selectable
jumper.
Table 4
shows the connections of these eight push-button switches to the CPLD I/O pins in the
different package types.
Figure 4.
Circuit Diagram of the Push-button Switches and Jumpers for the I/O Pins
Table 4.
ATF15xx Connections to the I/O Pin Switches
44-pin TQFP
44-pin PLCC
84-pin PLCC
100-pin TQFP
Push Button PLD Pin
Push Button PLD Pin
Push Button PLD Pin
Push Button PLD Pin
SW1
15
SW1
21
SW1
54
SW1
48
SW2
14
SW2
20
SW2
51
SW2
36
SW3
13
SW3
19
SW3
49
SW3
44
SW4
12
SW4
18
SW4
44
SW4
37
SW5
8
SW5
14
SW5
9
SW5
96
SW6
5
SW6
11
SW6
6
SW6
98
SW7
2
SW7
8
SW7
4
SW7
84
SW8
44
SW8
6
SW8
80
SW8
99
R19
1K
SW1
VCCIO
C13
0.001uF
JPS1
SIP2
SW1
R29
1K
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