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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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