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SDA Operator's Manual
PLL Locking
The PLL in the serial trigger module must be locked for the trigger to operate. Locking is indicated
by the closed padlock icon
. The icon becomes an open padlock and flashes when the PLL
is not locked. Lock the PLL by pressing the Lock CDR PLL button
. Once locked, a
"PLL Locked" message appears and the data rate is displayed. The PLL will remain locked until
the signal is removed from channel 4 or its data rate is changed, regardless of whether the
triggering mode is set to serial or not.
Setting the Data Pattern
The 32 bits in the pattern are set using the controls on the right half of the "CDRSerialTrigger"
dialog:
Using the matrix of buttons, you can set the value of each bit in the pattern to 1, 0 or X (dont
care). The values are selected by touching each button and cycling through to the desired value:
The buttons are arranged in four rows, each row corresponding to an 8-bit word, with
corresponding bit values displayed alongside each row of 8 buttons. Hexadecimal digits
corresponding to each group of 4 buttons are displayed to the left. Hex digits that contain one or
more don't care values are displayed as an X. The 32-bit binary pattern is displayed in the box
above the matrix of buttons.
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SDA-OM-E Rev H
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