Xilinx Frequency Generator for Spartan-3E Starter Kit - Manual (Page 4)

Frequency Generator for the Spartan-3E Starter Kit 4
Operating Instructions
Output frequency provided on SMA connector (J17)
and J4_IO12.
In this mode rotating the knob to the left or right will cause the display
cursor to move in the corresponding direction on the upper line of the
display. Use this mode to position the cursor below the digit you wish to
adjust and then press and release the knob to change mode. The
cursor automatically skips past the decimal point and space separator
and hits ‘end stops’ if you over rotate the knob.
= Edit cursor position mode
LEDs indicate the editing mode.
The cursor is the small
black line under the digit
in the top line.
= Edit digit value mode
Press and release knob to toggle between frequency editing modes
Edit cursor position mode
In this mode rotating the knob to the left or right will decrement or increment the value of the digit located at the cursor position. The controller will
automatically borrow from, or carry to, the more significant digits to the left of the digit being adjusted. Every adjustment will immediately result in the
corresponding frequency change at the output which is also reflected by the changes to the computed DDS control values on the lower line of the display.
Press and release the knob to revert to cursor position mode when complete.
Edit digit value mode
The cursor can be moved into the
10MHz and 100MHz digit positions but
these positions are blanked when zero.