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# 1. Define clock create_clock -name "clk_in" -period 20ns [get_ports {clk_in}] # 2. tco constraints # 2.1. Here, 2ns is tsu of external component set_output_delay -clock "clk_in" -max 2ns [get_ports{pout}] # 2.2. Here, 3ns is th of external component # ! Use negative value of th ! set_output_delay -clock "clk_in" -min -3ns [get_ports{pout}] # 2.3. Here, 3ns is tco of external component set_input_delay -max 3ns -clock "clk_in" [get_ports{pin}] # 2.4. Here, 2ns is minimal tco of external component set_input_delay -min 2ns -clock "clk_in" [get_ports{pin}]
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原文地址：http://www.cnblogs.com/byeyear/p/4320958.html
