The tool will calculate cell delays by interpolating between the input slew and output load given in the LUT. Hence there is no minimum pulse width violation at the CP pin for src_clk. 2) Break the nets in the case of long nets. Re-route through a less congested area so that the net is more straight. Wherever it was possible driver cells were up sized. If arrival time increases, setup violation comes otherwise hold violation comes. Newly added cells are moved nearer as much as possible to the nearest available locations based on the connectivity with the existing cells. Transition Violations • Signal takes too long transiting from one logic level to another – meta-stable • Fix transition violations – modify data path, instead of adjusting register location, or adding buffers to the global clock; otherwise you cause more violations than you fix – reducing capacitance – adding a buffer If the transition time is violating the library limits then the timing calculation will not be very accurate. The one marked as dont_touch_net and clock_net will be ignored by the opt enginee. *info: Start fixing DRV iteration 1 ...*** Starting dpFixDRCViolation (383.5M)*info: 4 don't touch nets excluded*info: 17 io nets excluded*info: 264 clock nets excluded*info: 490 violations may not be fixable:*info: 490 violations on clock net (remark C). The .lib or .db will contain the max_transition allowed for all the standard cells. Check your constraints file to see if you are overconstraining the design. There are two ways the transition time constraints can be given. The usual tendency is to fix the DRV's which directly impacts the timing violations on the go and leave the other less harmful violations which has much slack margins to be fixed at the end. The duration of this time is proportional to the rise or fall time of the input. This thing you can do with the help of optimization constraints. Pls suggest on improving max tran violations in SocEncounterafter after routing. In both cases, no current flows from VCC to GND. The one marked as dont_touch_net and clock_net will be ignored by the opt enginee. This caused long routed nets causing huge transition violation. If it happens, one should revert the fix for the same DRV and add buffers strategically placed so as to distribute the load as discussed later in this text. Now a day’s power consumption is becoming a major issue. Different type of "Design Rule Constraints". This is specified in the clock spec file: SinkMaxTran 400psBufMaxTran 400ps. Method of exchanging the Constraints across Different tools: There are basically two types of Design constraints: Design rules constraints are defined by the ASIC vendor in the technology library (. However, after post route, I can see around 100 of max_tran violations but there is still no setup and hold violations. great work especially with clearing the concept of increasing transition time, i have one query, Way to calculate should be more specifice. I will certainly return. Transition time is defined by the time it takes the signal to rise from 10%(20%) to 90%(80%) of VDD is called rise time and fall from 90%(80%) to 10%(20%) of VDD is called fall time. Transition Time from table lookup and interpolation/extrapolation. The actual signal is high for 2.9731ns. Now you can understand how important max tran is.--one more reason of fixing ma transition violation is that bigger transition will result in bigger DC power consumption.--the margin in 30% of max transition is allowed. From other website: ... and the last value in the table is the max_transition of the pin. I found your blog using msn. (Details we will discuss in another blog). As a rule of thumb to be noted here is to never leave the DRV to be fixed at last stages of the design cycle. I am still not clear with the difference between .lib files and sdc files. In the Next part we will discuss maximum Fanout - another type of Design Rule Constraints. Niece blog,I need your help here,You mentioned that transition time varies with frequency.So do you mean to say that during my Gate level simulation suppose my input frequency changes my transition time time will also changes? Fixing Max Cap and Max Tran Violations - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. Almost every time, fixing a DRV can result in a hold violation. Here, the clock signal at clk_ctrl_reg/CP should be high at least for 0.3202ns (please note that the default time unit is ps in TEMPUS). Transition Violations: When a signal takes too long transiting from one logic level to another, a transition violation is reported. Re route the input net in higher metal layer, Adding buffer in the middle of long route. First off I would like to say excellent blog! 2) It will increase the Dynamic power dissipation as both nmos and pmos will be on for extended period of time. Let me know in case you need any specific detail. The Trans violation can be because of node resistance and capacitance. Wherever it was possible driver cells were up sized. This info is present in the .lib file (liberty file). will it make change in my .lib file? set_max_transition [current_design]
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