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40 Threads found on Star Extraction
I'm a rtl engineer. I'm confused between the difference of sdf and spf back annotation. As I know sdf came from STA( PT) and SPF came from star-RC. So In my experiance, the sdf used to timing close the netlist without RC elements. then this netlist to send a PNR team. After extraction RC elements in layout team by starRC. Then finally we (...)
How to extract spef from star rc...?? to my knowledge i think 3 files are necessary. 1 routed def 2 file for synopsys 3 rc corner please correct me in inputs if i am wrong. How to get rc corner file ?? if possible plz say me the inputs and where to get from ??
Hi, I'm using bicmos9mw proces from STM for my design, my design flow is as follows : cadence ic 5.1.41 for scheme Calibre for DRC and LVS star-rcxt (F-2011.06-sp2) for parasitic extraction. Anyone have a tuturial about extraction with star-rcxt? wich files ( rule file,tech file, mapinng file, input and output file) (...)
why to verify timing after routing stage in physical design? why to verify timing after star-RCXT extraction in physical design? Please give me the answer
RC extraction from a tool like Synopsys star-RC will spit out an HSPICE SUBCKT netlist with Resistances and capacitances corresponding to the different layers in your layout in addition to the transistors. It might include the area/perimeter of your transistors but the best estimate of your net area should come from looking at layout directly. RC e
During a Calibre-RC extraction to generate an fsdb file, is their a switch I need to set so that so that the names of devices and instances get their names from the source which in this I would like to be the schematic netlist? I know that in star-RC I would set XREF:YES to achieve the same. Is there an equivalent switch in Calibre-RC? Without this
Yes, birdy123 is right. You can not load such report. But, there is such ICC command as signoff_opt. It takes your design and runs star-rc (for RC extraction) and PrimeTime (directly from ICC session). Then, it loaded ptime results and trying to optimize design based on star-rc+ptime results.
hi, I have an issue with GDS/CDL based SPEF extraction using Calibre CCI based star flow. In Custom world, Instances are prefixed with "X" Nets are using angle brackets "<" , ">" In Digital world, Instances do not have "X" prefix Nets are using square brackets "" Does star have any option to do this mapping wh
We use the Industry standard Parasitic extraction tools like star-RC & QRC. What is the basic procedure followed by these tools?
Hi V, I dont think there is any workaround for this other than using a parasitic extraction tool such as star RC to generate a spef file cheers
WimRFP, There are some concepts of phisics not yet neither well known and explored by scientific comunity. The fact is that vacum energy extraction implies proximity of a star, where nuclear fusion generate magnetic dipoles that are the power supply of those aparatus. engineerpervez1, I buyed a book of this subject, but unnafortunnately,
Hi I am new to Synopsys tools and I need them to perform parassitc extraction with star RCXT. Looking at the different options it seems to me that the easiest way is to built a MW database running Hercules on a gds and a spice netlist. I have been able to perform DRC and LVS (with the option to extract view). Finally my LVS passes but I have a
hi, why the power nets are treated as special in layout extraction?.and what are all the extra parameters they can taken into account when extract power nets...
hi all, do we need a netlist for the starRc extraction?..and what is the use of LEF file in star RC extraction
... GND signals are star connected to one common pin GND_* The various GND_moduleX_* route parts carry different currents and current waveforms, and own different R-L-C parasitics after parasitics' extraction. Hence the interference signals (noise, EMI) on the various GND_* nodes will be different, and it is po
Hi, What are all the inputs required for the star-RC-XT. (extraction) How will you ensure that the extraction data is clean of shorts & opens and how to ensure that the extraction data is in sync with the final PnR database ? Thanks, Gops
after u are done with Synthesis and P&R , follow these steps 1) Do RC extraction ( Parasitic extraction) . for eg. Synopsys star-RC ( or Cadence Assura) Tool will do it. It will generate spef files. 2) Run STA for Timing Analysis for eg. Synopsys Primetime Tool will do it. Input to it is your spef file and gate-level (...)
For RC extraction i am using star_RCXT. THis tool is called while performing PLS(post layout simulation). After the setup is done- that is feeding the gds and cdl, slecting type of extraction etc, while running extraction star-RCXT gives me an error: Missing header file. Subcircuit defination may be (...)
calibre CCI--- star-rcxt flow support gate-level RC extraction? OR the flow only support transistor level RC extraction? thank u
the best one is star-RC user manual, it will not only provide the basic knowledge and will also teach you how to use the tool
Dear Sir, If your Astro file have CapModel or CapTable definition, it means you have tlu model for RC extraction in Astro. You can use it to do placement and routing. The .itf file is TLU+ model.(use star-RCXT transfer .itf to TLU+ model) The TLU+ model accuracy is more than TLU model. Best Regards, chyau
Hi all, We are trying to run star-RCXT on a mixed-signal layout that includes digital standard cells that we are not provided full layouts for. i.e. the poly layer is missing. We want star-RCXT to just ignore the standard cells but it isn't working. This is preventing star-RCXT from successfully extracting and back-annotating our (...)
U can use star RC as parasitic extractor...get the GDS of the cell that u want to extract and give the GDS as input to star will generate the gds netlist and then run parasitic extractiion...u can also give circuit netlist to get accurate results..extractor will generate a spf file where all the RC details will be present for each and every
Dear Sir, I guess star-rc for 2D extraction, star-rcxt for 2.5d extraction, so star-rcxt have more accuracy. As for star-dc is a delay calculator as like prime-time. Best Regards, chyau
Synopsys star RCXT is also widely used in industry as a tape out tool.
tlup and tlup+ are both parastic model for astro to estimiate net load. tlup is 2d model, while tlup+ is 2.5d model, with more parastic cap model provided, and is more accurate than tlup model. and star-RC use 3d model extraction, thus cause post sta to be most accurate, but also most possimistic.
star RCXT generated SPEF will be more accurate compared to APR generated SPEF. The extraction algorithm used by star RCXT generates better result...... This is my understanding when i did a comparison with SPEF's generated by both RCXT & APR tools.
after LVS and DRC finished, you can use star-RC or DRACULE get the parasitic extraction. but this is up to the speed you want to design. if this is not in high speed, it is not necessary to exctract the parasistic
Could anyone help me about spice extraction with star-RC and Hercules? Thanks a lot.
Could anyone help me about spice extraction with star-RC and Hercules? Thanks a lot.
hi, what r the other rc extraction tool available other than star-rcxt and fire & ice?????? thanks, Prasad
I am having this timing problem and seek suggestions: The pre-layout synthesis met all the timing. The layout tool (Encounter) had timing violations with wire model. The wire model used was not accurate enough so a post-layout timing analysis with PT (RC extraction with star RC, SDC files, and routed netlist) was carried on. The post-layout timi
Filler Cells are used to avoid the Base Layer ( Nwell, PPlus, NPlus ). The flow is, * Insert the Filler cells once you're done with the Routing & Optimization * Then dump the DEF from implementation tool. * Parasitic extraction from QRC/star-RC * Timing Analysis using PT * If Timing Violations are there, then go back to the Implementation tool. *
Hello, I have the following problem: I want to do a parasitic extraction with star-RCXT, but to keep the RC data, only on a list of nets of interest. Made the list with the nets, ran the extraction, and after a while, realised that the output netlist contains devices and pex information only for the specified list of nets. The devices (...)
Hi, Can someone tell me if there is any way to generate hierarchicaly extracted netlists with star-RCXT, in any of the SPF or NETNAME formats? Can this be done with other extraction tools? Thanks!
Hi, SPEF file describes spice netlist and RC infromation. After running LVS(LVS correctly), you can generate SPEF file from RC extraction tool(Xcalibre,Calibre-XRC--Mentor star-RCXT--synopsys) or APR tool. As for SDF file, it describes cell delay(from synthesis library) and interconnect delay(from SPEF file). You can generate
You can run Herculus first ,and get a milkway data ,and then run star-rcxt.
HI ls000rhb, Although you can do this, but it is of not much use. Find out what is the sign-off tool for the tape-out. Usually, the RC extraction engine from the P&R tool is not acceptable for sign-off. Popular sign-off RC extractioin tool are star-RC-XT, Fire-and-Ice or XRC. Once you have the spef from the RC extraction sign-off tool, (...)
Hi , Can we use GDSII file only to star-RC for parasitic extraction?? Can anybody know how to do this? Thanks.
star-RC is good 3D LPE tool. And star-rcxt is especially for Digital circuit LPE. But just for Sun-unix and HP-unix.