2Mhz Oscillator And Clock Selection Jumper - Atmel ATF15 DK3-U Series User Manual

2MHz Oscillator and Clock Selection Jumper

The Clock Selection Jumper labeled JP-GCLK on the CPLD Development/Programmer Board is a
two-position jumper that allows the users to select which GCLK dedicated input pin (either GCLK1 or
GCLK2) of the ATF15xx device should be connected to the output of the 2MHz 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 device.
jumper.
ATF15xx device in all the different available package types.
Figure 6.
C21
0.1uF
Table 6.
GCLK1
GCLK2
10 ATF15xx-DK3-U Development/Programmer Kit [USER GUIDE]
Atmel-8961A-CPLD-ATF15xx-DK3-U-Development-Kit-UserGuide_072015
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Figure 6 is an illustration of the circuit diagram of the oscillator and selection
Table 6 shows the pin numbers for the GCLK1 and GCLK2 dedicated input pins of the
If GCLK1 jumper is set, the jumper will be located toward the side of the board. On the other
hand, if GCLK2 jumper is set, the jumper will be located toward the middle of the board.
Circuit Diagram of Oscillator and Clock Selection Jumper
JPGCLK
GCLK2
R17
1K
OSC
VccOSC
1 4
2 3
2MHZ
Pin Numbers of GCLK1 and GCLK2
44-pin TQFP
37
40
GCLK1
R18
1K
R39
100
44-pin PLCC
43
2
84-pin PLCC 100-pin TQFP
83
2
87
90