Hardware Description
2-6
CPLD Development/Programmer Kit User Guide
3300A
–
PLD
–
08/02
2.1.2
Push-button
Switches
Two push-button switches are provided to allow the user to control the logic states of the
OE1 and GCLR inputs of the ATF15xx. These two switches are labeled GOE and GCLR
on the board. The GCLR push-button switch is a momentary Single-Pole Single-Throw
(SPST) normally open switch while the GOE push-button switch is a snap-acting
momentary SPST normally open switch. As shown in the CPLD Development/Program-
mer Board schematic in Figure 4-1, these two switches are normally open and the
GCLR and GOE signals are pulled-up to V
CC
when they are not depressed. When the
switches are depressed, the GCLR and GOE signals are connected to GND.
The output of the GCLR switch is connected to the GCLR dedicated input pin of the
ATF15xx, and it is intended to be used as an active-low reset signal to reset the regis-
ters in the ATF15xx. The output of the GOE switch is connected to the OE1 dedicated
input pin of the ATF15xx. It is intended to be used as an active-high or active-low output
enable signal to control the enabling/disabling of the tri-state output buffers in the
ATF15xx. However, these two switches can also be used to generate general logic input
signals to the GCLR and OE1 input pins of the ATF15xx.
2.1.3
Clock Select Jumper
The Clock Select Jumper, labeled JPCLK, on the CPLD Development/Programmer
Board is a two-position jumper that allows the user to select which GCLK dedicated
input pin (either GCLK1 or GCLK2) of the ATF15xx should be connected to the output of
the 2 MHz crystal oscillator. In addition, the jumper can be removed to allow an external
clock source to be connected to GCLK1 and/or GCLK2 of the ATF15xx.
Table 2-9 shows the pin numbers for the GCLR, OE1, GCLK1 and GCLK2 dedicated
input pins of the ATF15xx in all the available package types.
Table 2-8.
Connections of LEDs to ATF15xx 160-lead PQFP
DSP/Sgt
PLD Pin #
DSP/Sgt
PLD Pin #
DSP/Sgt
PLD Pin #
DSP/Sgt
PLD Pin #
1/A
91
3/A
102
5/A
11
7/A
29
1/B
89
3/B
100
5/B
159
7/B
27
1/C
90
3/C
98
5/C
160
7/C
28
1/D
80
3/D
101
5/D
10
7/D
52
1/E
73
3/E
103
5/E
12
7/E
50
1/F
78
3/F
105
5/F
13
7/F
53
1/G
72
3/G
106
5/G
14
7/G
51
1/DOT
88
3/DOT
97
5/DOT
158
7/DOT
25
2/A
69
4/A
110
6/A
20
8/A
43
2/B
71
4/B
108
6/B
18
8/B
49
2/C
68
4/C
109
6/C
16
8/C
30
2/D
92
4/D
123
6/D
19
8/D
31
2/E
94
4/E
111
6/E
21
8/E
32
2/F
93
4/F
121
6/F
23
8/F
41
2/G
96
4/G
122
6/G
24
8/G
33
2/DOT
70
4/DOT
107
6/DOT
15
8/DOT
48
