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about mechanism of CTS ??

After cts tracing the clock path, cts will divide many steps to do local cts (then use macro model to do cts upper level) from Sinks up to source clock as below for example:

**** CK_START: Update Database (mem=3265.2M)
36 Clock Buffers/Inverters inserted.
**** CK_END: Update Database (cpu=0:00:00.0, real=0:00:00.0, mem=3265.2M)
**** CK_START: Macro Models Generation (mem=3364.6M)

* sink: max rise/fall tran=[276,286], (bnd=200ps)
*buffer: max rise/fall tran=[651,494], (bnd=500ps)
**** CK_END: Macro Models Generation (cpu=0:00:10.7, real=0:00:11.0, mem=3370.6M)
SubTree No: 329

Input_Pin: (u_center_ctrl/u_clk_sys_buf1/A)
Output_Pin: (u_center_ctrl/u_clk_sys_buf1/Y)
Output_Net: (u_center_ctrl/sys_clk_buf1) DontTouch
**** CK_START: Macro Models Generation (mem=3364.6M)

* sink: max rise/fall tran=[276,286], (bnd=200ps)
*buffer: max rise/fall tran=[651,494], (bnd=500ps)
**** CK_END: Macro Models Generation (cpu=0:00:10.8, real=0:00:11.0, mem=3370.6M)
SubTree No: 330

Input_Pin: (u_center_ctrl/u_and_3/B)
Output_Pin: (u_center_ctrl/u_and_3/Y)
Output_Net: (u_center_ctrl/sys_clk_pwr) DontTouch
**** CK_START: Macro Models Generation (mem=3364.6M)

* sink: max rise/fall tran=[276,286], (bnd=200ps)
*buffer: max rise/fall tran=[651,494], (bnd=500ps)
**** CK_END: Macro Models Generation (cpu=0:00:10.8, real=0:00:11.0, mem=3370.6M)
SubTree No: 331

Input_Pin: (NULL)
Output_Pin: (sys_clk)
Output_Net: (sys_clk) DontTouch
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

can someon interpret the mechanism of cts in detail ? thanks

BobD over 15 years ago

I think the best way to get a feel for the structure of the clock tree that's been built is by going to Clock->Clock Tree Analyst. It provides a rich set of features that allow you to visualize the clock network structure on a time axis and debug all sorts of situations that commonly occur on clock trees. More information on this capability is available here:
http://sourcelink.cadence.com/docs/files/Release_Info/Docs/encounter/encounter8.1.3/clockG.html#1108188
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