Sep
4, 2007 (Rev 2.1s)
12/26
TB-5V-LX110/220/330-DDR2Hardware User Guide Rev2.1s
Oscillator
The board is provided with one differential LV-PECL PLLIC (DIP switch setting for variable frequency)
and two oscillator sockets that are connected to the FPGA’s GCLK pin.
Be sure to set the 16MHz oscillator that comes with the board to a correct pin position of the oscillator
socket (X1) that is connected to the PLLIC.
If an oscillator other than that provided with the board is used, select a 3.3V oscillator. Either DIP14
or DIP8 pin size oscillator package can be supported.
Note: There are 3.3-2.5V level shift buffers between OSC socket (X3/X4) and FPGA.
Example of oscillator setting
Figure.10 How to insert an Oscillator
DIP 8Pin Type
DIP 14Pin Type