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Insuch cases the sentence should be kept as short as possible:
In Clock Tree synthesis, can you explain about the importance of buffer,insertion delay,clock skew,slew rate and minimization of power.
You can specify various options in CTS and clock tree results. In the clocktree specification file, you can specify "RouteClkNet" option. If thisoption is set, CTS calls NanoRoute after finishing synthesis of clock tree andperforms clock tree routing. If this option is not specified, then clock net isrouted by NanoRoute during routing phase of the flow. If "RouteClkNet"is set to "Yes" then you can set "Display Clock Tree" optionin the clock tree synthesis box. Display clock tree returns an error if clocktree routing is not performed.
Virtual Clock and Synthesize :) - Cadence Community
To understand create CTSF manually and for more information on clocksynthesisrefer to . After goingthrough thiswebpage and the tutorial above, attempt the lab given below. You haveto submita report of your observations after CTS runs with all the specificationfilesprovided.
After performing CTS for each of the above specification files, report clock tree and implement routing --> extraction --> timinganalysis as in the above flow.
CTS report generated after ckSynthesis is very verbose and you canextract # of buffers inserted, # of levels, types of buffers inserted,insertion delays etc.
May 14, 2014 · Synthesis, timing closure, ..
For synchronized designs, data transfer between functional elements are synchronized by clock signals. In a top level digital design, you will have one more more clock sources, like PLLs or oscillators within the chip. You may also have an external clock source connection through an IO. For a digital only block, you will have a clock pin that will be the clock source for the block in question. Clock balancing is important for meeting the design constraints and clock tree synthesis is done after placement to achieve the performance goals.
CTS is performed during virtual prototyping, block implementation andtop-level implementation flow steps of design with SOCE. In each ofthese types of implementation, CTS is performed after placement (amoebaPlace). Torun CTS, you need the following list of files:
1. Clock tree specification file
2. Verilog netlist
3. GDSII or LEF physical library
4. Proper RC model from LEF, Encounter technology file, or Encountercapacitance table
5. Timing constraints file (optional)
6. Synopsys .lib file or TLF file with timing models for standard cellsand cell footprint names
7. Placement information, such as a DEF file or an Encounter placementfile
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Use of virtual Clock in SDC - Cadence Community
This is definitely not something we want. Think just about the load of one clock net. No driver can drive that many flops! But when it is a synchronising signal like clock, load or fanout is not the only thing we are worried about. We also want a “balanced” tree, that is the skew value for the clock tree should be zero. After clock tree synthesis, the clock net will be buffered as below.
Analog modeling synthesizer - Wikipedia
Two branches of tree, but one clock sink has a very high insertion delay before CTS.(Maybe due to gates, muxes etc). CTS will then be required to match this delay in all sinks(plus any extra delay due to synchornising.). This can then be addressed preferably by changing the design OR making the clock tree synthesis ignoring this path.
An analog modeling synthesizer ..
Since the jitter affects the clock delay of the circuit and the time the clock is available at sync points, setup and hold of the path elements are affected by it. Depending on whether the jitter causes to clock to be slower or faster, there can be setup hold or setup violations in an otherwise timing clean system. This will in turn lead to performance or functional issues for the chip. So it is necessary that the designer knows the jitter values of the clock signal and account for it while analyzing timing.
Synth Constraints | Latency (Engineering) | Synthesizer
Suppose in my design there are multiple clocks. In such a case how the tool decides priority for each clock tree??
If I am having clk1, clk2, clk3, clk4 and clk5, which one will be synthesized and routed first? While optimization, which one will be most optimized?
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