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Nexxim Simulator > QuickEye BitlistsQuickEye convolves the step responses with a stream of bits to generate the eye data. The QuickEye Source generates the binary data using one of several methods. • The netlist can contain the bits as an explicit list using the BITLIST parameter. • The netlist can point to a file that contains the data, using the BITFILE parameter. See Bitfile Formats below. • The source can generate a sequence of random bits, controlled by the RANDOM_BIT_COUNT and RANDOM_SEED parameters. • The source can generate a pseudorandom sequence of bit patterns of length 7, 11, 23, or 31. Any of these bit sources can be repeated using the REPEAT_COUNT parameter. The default is one time through the list (REPEAT_COUNT=0). In addition, the bitstream can be the worst-case pattern from PDA. When the PD_COUNT parameter is set to 1 or higher in the QuickEye analysis setup, the Eye Source uses the worst-case bit pattern with REPEAT_COUNT set to (PD_COUNT). Bitfile Formats A bitfile for QuickEye can be a simple text file (.txt extension) containing a list of 0s and 1s without separators. A QE bitfile can also use a Coded Bit Pattern (.cbp extension). A coded bit pattern file has two columns: tag repeats. The tag column entry specifies the type of bit pattern to generate:
The repeats column entry tells how many (integer) repeats of the given bit representation to generate. A line beginning with an exclamation point is a comment. Here is an example: ! example coded bit pattern file zero 10 random 100 one 1 zero 42 lonely_1 3
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