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45 Threads found on edaboard.com: Filler And Cells
Hello all, I wanted to to have a simple modification in my layout design in Encounter, so I saved a design database in Encounter using "saveDesign AES.dat" (where "AES" is my design name). Then I run "ecoDesign AES.enc.dat AES eco.v" (where "eco.v" is my modified synthesized netlist). AES.enc.dat is a design restore script file containing
Hi, I know there are multple threads about this question. But did not find what was I looking for, I know Endcap at the end of rows and around macro, fillers in between design to fill the gaps n well continuity, and Decap for IR drop to give exra capcitance... My question is what End cap has so special that it will be placed at the (...)
Hi All, Which type of filler cells should add in soc encounter,I have fill 1,2,4,8,16,32,64 sized and for well tap and end cap also the same values. Which size should i add ?? also while adding end cap cells,it is asking for precap cell and postcap cells ?? What i shud (...)
Did you add filler cells?
End cap cells usually go at the end of each row and contain decoupling capacitors. filler cells are used to fill unused spaces in each row (i.e. where there are no logic cells) and just have metals to connect the horizontal power rails.
Hi, filler cells are added for n well, pwell and metal 1 continuity. Why should n well p well be continuous ? I understand that Metal 1 should be continuous for min density reasons and EM reasons. What exactly is power continuity ? Thanks in advance. :-D
Hi all, Please can me someone explain differences between these terms? macro cell filler cell ECO cell all are taken from TSMC 90nm PDK documentation. Thanks a lot.
As from the definition of ESD you can understand that uncontrollable current flows between source and drain which only stops when transistor breakdown happens . So that means ESD can destroy your whole chip. This ESD is also known as Latchup. so to overcome this we add filler cells which make the n-well continuous this (...)
Hello Guys, Recently I studied some where regarding filler cell like this can any one please explain the following statement in detail. filler cells also provide decoupling capacitance to complete the power connections in the standard cell rows and extend N-well and P-well (...)
well, normaly the std cell library provided some filler cell to fill the n-well and power rail between two std cell. but this step should be done by the PnR tool, not in virtuoso, or do you made a small block in the analog tool env? The filler cells are here to respect the DRC between two std cell not abuded.
Hi, Yes of course this filler and capacitors are needed to be included in the design is used for device encapsulation and to avoid uneccessary effects of fields that causes the chage in Bulk(silican die) properties... and you can route to VDD and GND using place and Route tool.. (...)
The filler cell are required to have a continuous n-well between each std cell, and certainly fix this latch-up DRC.
hi friends, i have one doubt. we are using filler cells in between physical design flow right, and metal filling is used at the final stage. what is the difference in between these two?? can any one explain on this
Hello people! I am trying to do floor planning for my design for the first time. Actually I have done the basic fllorplanning and have placed the i/o pads as well but not the macro cells ( placement in the core area) yet. I verified the geometry after this step and found a lot of spacing violations and short violations (...)
hai limitless_21, ? What are the various factors that need to be considered while choosing a technology library for a design? The technology lib should have all the cells which u are having in the RTL. Additionally It should have the filler,Tie, endcap and decap cells. Then the cells should have (...)
Hi, After I insert stdcell filler in my design ( insert_stdcell_filler -cell_without_metal {mv07fill8 mv07fill6 mv07fill4 mv07fillvcc1} -cell_with_metal {mv07fillvcc8 mv07fillvcc6 mv07fillvcc4} ), I run detail routing with incremental option. But the result is that ICC routed these filler cells and (...)
Hi All, I would like to add my points here. Spare Cell : ( Placed before the Placement to avail the uniform distribution) These cells will be used if any Timing/Functional ECO has to be performed after the Tape-out. Generally these cells will be a bunch of universal gates and placed uniformly all over the chip. Lets say your chip is
The filler cells do not contain any devices - just M1 power rails and NWELL. So, nothing to compare during LVS.
Hi Guys, Are multi Vth filler cells only Nwell implants or are they full PMOS devices with VDD and VSS taps? As threshold voltage gets mentioned, I assume they have a gate and diffusion regions. If they are just Nwell implants on P substrate i.e. diodes, what is meant by threshold voltage? Thanks.
Hi. I am very new to the field of physical design and its still my initial days. I have frequently come across concepts like n-well continuity and power continuity in relation to filler cells and corner pads. I am unable picture these concepts and cannot really understand (...)
Hi, when I add iofillers ,using the geometry check in soc encounter, there are some short errors in 1.8v VDD pad and VSS pad. and the error show that there are short between this pads and adjacent filler cells, I checked in the Virtuoso and find nothing unnormal, So why ? (...)
Hi, >>But why it is better to insert filler cells after routing? Still P & R tool might be optimizing the design to meet the timing by moving the cell here and there, that is why filler cells will inserted after routing. Regards,
filler cell is also dummy poly/OD in 40nm cell library, which is used for process uniformity.
Hi all, As per i know in core filler cells, there are two types. One with base layers only and another with some dummy logic in which the poly will be connected to VDD or VSS. Could anyone explain in brief??? If you provide any screen shots of the core filler cells, it will be (...)
filler cells are used to keep the continuity between Nwell, PPlus, Nplus & Power Bus( Vdd & VSS). See the following topic:
Can you explain the function of the filler cell in P&R process. and what is the physical construct of the filler cell, thx
What is the difference between core filler cells and metal filler cells?
Hi, We have filler cells in stdcell layouts. Can we fill OD inside those filler cells. Generally fillers will be with out OD, POLY layers. What will be the effect of the filler cell if we add OD layer inside and how would the functionality change? Can anybody (...)
in popular standard IO cells libs such as tsmc/umc/smic/charter, etc. IO filler is already exist. just use them is ok.
Hello, Can anyone please comment on the difference between welltap cells and filler cells used in PnR? Thanks, Prasad
filler cells are used to keep the continuity of NWell, Vdd & Vss rail & as well as to avoid the DRC violations. What is meant by corner & scribe seal?. I never heard of those cells.
The filler cells usually have widths that are given as 1x,2x,4x,8x,16x and so on.. The next bigger filler cell always has its width doubled wts the reason behind it???????????????
5. SDC obtained after systhesis must give u prorper idea abt clocks in design 8. since filler doesnt affect timing, there is no need to add them in earlier stages of routing. 9. Most of P&R tools look only at the metal layer present in std cells,they are not much botherd about (OD, active or diffusion layer). with only metal info visible it may
Hi, When i finished P&R with Astro,and do "Dump Hierarchical Verilog",i have selected the option of "no core filler cell instances" and "no pad filler cell instances",but 1>the output verilog netlist still contain filler cells 2>it also contains some "assign" statement,such as: (...)
HI, I have been implementing a design with Astro.After CTS my design meets timing and I tried to add filler cells before routing the design.But once filler cells are added the utilization goes to mode than 100% resulting in an there any command to stop adding filler (...)
Placement blockage applies only to the cells in the netlist, not to filler cells. The tool is behaving correctly. It does not matter if filler cells are placed under stripes because it does not contain i/o pins so there is no possibility of shorts to stripes due to routing to the i/o pins. The (...)
Hi Pandit, Decaps are used to provide the power, to meet the power requiremnets when the dynamic switching happens. Decaps are placed similarly how u place filler cells. Normally put where there is more switching activity .
you question means nothing... ECO :engineering change order is lteration process. there is no similiarity or difference between this dummy cells.. there are just filler cells.. just to increase density. after final tapeout if any change in netlist or stuck at 0 or 1. then using spare cells.. some process will be (...)
First, you can import the design into Encounter to let FE place I/O pads automatically. Second, write out the IO file using FE. Third, manually edit above IO file according to your requirement. ps: IO filler cells do not have to be put into the io file, and can be placed later inside FE. (...)
Normally pad ring does not need special instructions to connection. When you add pad filler cells, they are connectec automatically.
Hi all, I am working with Cadence SOC Encounter. In that we have an option of adding filler cells. I shall be greatful if some one gives me the details as why we shud add these this filler cells 1.Why we actually need filler cells in the Design Thanks in Advance
you may insert themwhen you layout your chip. after the place the cell, You may insert the spare cell as same as the insert the filler.
Hi, Under the pad library fromTSMC we have 9 feeder cells.Are they same as filler cells.I am asking this question as in magma tool we have toput a propery called model_type on each cell and only pad_filler is available nothing like feeder is available. Regards Vicky
filler Cell are empty cells with only Power and Ground Rails. After Place and Route there will be enpty areas left in the row and hence the power will not reach all the cells due this discontinuity. After adding filler cells this discontinuity will go away. (...)
Can anyone tell me more about filler cells used in layout design .. why used ? advantages disadv if any