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34 Xilinx Development System
Xilinx System Generator v2.1 Reference Guide
Block Parameters Dialog Box
The Counter block parameters dialog box is invoked by double-clicking the block
icon.
Figure 3-8: Counter block parameters dialog box
Parameters specific to the block are:
• Number of Bits: specifies the number of bits in the counter.
• Binary Point Position: specifies the location of the binary point.
• Arithmetic Type: specifies the block ouput to be either Signed or Unsigned.
• Start Count at: specifies the starting and reset value. The default is zero.
• Count to Value: specifies the ending value, the number at which the counter
resets. A value of Inf denotes the largest representable output in the specified
precision. This cannot be the same as the start count.
• Count By Value: specifies the increment, which must evenly divide the
difference between the extreme values.
• Count Direction: specifies the direction of the count (Up or Down).
• Provide Reset Pin: when checked, the block operates as a free running
counter with explicit reset port. In this case, there is no Count to Value setting.
• Provide Load Pin: when checked, the block operates as a free running load
counter with explicit load and din port. The load capability is available only for
free running counter.
Other parameters used by this block are described in the Common Parameters section
of the previous chapter.