XESS XSV Manual page 10

Remove the cable to the parallel port connector.
q
Place shunts on jumpers J23 and J24.
q
q Restore power to the XSV Board.
Reconnect the cable to the PC parallel port.
q
Enter the following command in a DOS window:
q
XSSETCLK DIVISOR
where DIVISOR is replaced by the actual numeric divisor you wish to program into
the DS1075. This command will configure the XC95108 CPLD so it can program the
oscillator, and then it will program the oscillator frequency.
q Wait for the oscillator programming to complete.
q Remove power and the parallel port cable from the XSV Board.
Remove the shunt on jumper J24.
q
q Restore power and the parallel port cable to the XSV Board. The clock frequency
should now be 100 MHz ÷ DIVISOR.
You can substitute an external clock source for the internal oscillator. Follow these steps
to configure the programmable oscillator for operation with an external clock source:
Remove power from the XSV Board.
q
q Remove the cable to the parallel port connector.
Place shunts on jumpers J23 and J24.
q
Restore power to the XSV Board.
q
q Reconnect the cable to the PC parallel port.
Enter the following command in a DOS window:
q
XSSETCLK DIVISOR -EXTERNAL
where DIVISOR is replaced by the actual numeric divisor you wish to program into
the DS1075 and -EXTERNAL instructs the command to disconnect the internal
oscillator of the DS1075.
q Wait for the oscillator programming to complete.
q Remove power and the parallel port cable from the XSV Board.
Remove the shunt on jumper J24.
q
q Restore power and the parallel port cable to the XSV Board.
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