General Description: How do I use the syn_isclock attribute to specify a port on a black_box as a clock?
ソリューション
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The syn_isclock attribute specifies that a port on a black box is a clock, even though Synplify won't recognize the port name as a clock. (Recognized names are: clk, rclk and wclk.)
A clock buffer will be inserted at the top level when applicable.
Please see (Xilinx Solution 2713) for information on declaring a black_box within Synplify.