学习Xilinx公司开发软件ISE的基础资料

				@P:  Worst Slack : -16.044
				@P:  hdl_demo|clk - Estimated Frequency : 44.0 MHz
				@P:  hdl_demo|clk - Requested Frequency : 150.0 MHz
				@P:  hdl_demo|clk - Estimated Period : 22.711
				@P:  hdl_demo|clk - Requested Period : 6.667
				@P:  hdl_demo|clk - Slack : -16.044
				@P:  System - Estimated Frequency : 60.4 MHz
				@P:  System - Requested Frequency : 150.0 MHz
				@P:  System - Estimated Period : 16.564
				@P:  System - Requested Period : 6.667
				@P:  System - Slack : -9.898