| bufdump - A utility for dumping NSCL event buffers | ||
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Bit patterns are used to specify both filters and search patterns. Both of these terms are described later in this chapter.
A bit pattern is 16 bits that can have any of three states:
Requires a matching word to have a 1 in that bit position.
Requires a matching word to have a 0 in that bit position
Specifies that you don't care what the value of that bit position is.
Normally bit patterns come in sets. A bit pattern set can either represent a group of bit patterns, any of which can match to trigger the filter or search match, or a sequence, which requires a sequence of words in the buffer to sequentially match all the bit patterns in the set to trigger the filter or search.