152 Keysight InfiniiVision 3000 X-Series Oscilloscopes User's Guide10 Triggers• X sets the pattern to don't care on the selected channel. Any channel set todon't care is ignored and is not used as part of the pattern. However, if allchannels in the pattern are set to don't care, the oscilloscope will not trigger.• The rising edge ( ) or falling edge ( ) softkey sets the pattern to an edgeon the selected channel. Only one rising or falling edge can be specified inthe pattern. When an edge is specified, the oscilloscope will trigger at theedge specified if the pattern set for the other channels is true.If no edge is specified, the oscilloscope will trigger on the last edge thatmakes the pattern true.Hex Bus Pattern TriggerYou can specify a bus value on which to trigger. To do this, first define the bus. See"To display digital channels as a bus" on page 114 for details. You can trigger ona bus value whether you are displaying the bus or not.To trigger on a bus value:1 Press the [Pattern] key on the front panel.2 Press the Channel softkey and rotate the Entry knob to select Bus1 or Bus2.3 Press the Digit softkey and rotate the Entry knob to select a digit of the selectedbus.4 Press the Hex softkey and rotate the Entry knob to select a value for the digit.5 You can use the Set all Digits softkey to set all digits to a particular value.When a hex bus digit contains one or more don't care (X) bits and one or more bitwith a value or 0 or 1, the "$" sign will be displayed for the digit.NOTE Specifying an Edge in a PatternYou are allowed to specify only one rising or falling edge term in the pattern. If you define anedge term, then select a different channel in the pattern and define another edge term, theprevious edge definition is changed to a don't care.NOTE If a digit is made up of less than four bits, then the value of the digit will be limited to thevalue that can be created by the selected bits.
