Xilinx System Generator V2.1

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Basic Elements 33

Xilinx Blocks

The block can be conﬁgured as a free running up or down counter by

selecting the Provide Reset Pin option on the block parameters

dialog box. In this case, the block has a reset input port in addition to its

output port.

The output for a free running up counter is calculated as follows:

Here N denotes the number of bits in the counter. The down counter calculations

replace addition by subtraction.

The free running up or down counter can be conﬁgured to load the

output of the counter with a value on the input din port by selecting the

Provide Load Pin option on the block parameters dialog box.

In this case, the block has three (rst, Load, din) input ports in

addition to its output port.

The output for a free running up counter with load capability is calculated as follows:

Here N denotes the number of bits in the counter. The down counter calculations

replace addition by subtraction.

Xilinx System Generator V2.1 - Page 33