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28 Threads found on edaboard.com: High Fanout Nets
Hi all, Have a nice day !! I may implement my digital design using FPGA. Once the design is synthesized, i may read the HDL netlist file to introduce some design modifications, but i want to insert the logic at high fan-in and also high-fanout internal nets. In this regard, i want to know "is there any FPGA design (...)
Hello, How to deal with high fanout nets in synthesis with DC? Warning: Design '' contains 5 high-fanout nets. A fanout number of 1000 will be used for delay calculations involving these nets. (TIM-134) Net 'i_ahbram/n2858': 2110 load(s), 1 (...)
Hi While doing HFNS i got the high fanout nets using the dbGet command. but when i give buffertree synthesis command it says, two nets have no driver so It shows an error message and it aborts the buffer tree synthesis operation. The net it is telling "no driver" is actually a pin of macro. Do i need to give (...)
I think your problem is caused by high fanout nets.
high fanout nets: Some nets other than clock nets is called HFN. Ex: Reset, Scan Enable etc. During synthesis, We set set_max_fanout to some number. i.e. we are telling the synthesis tool to that more than the max_fanout number treat it as high (...)
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u can try "insertRepeater" in SOC Encounter , but this will not be able to fix high-fanout nets with fanout greater than 1000. If fanout > 1000 , run the optDesign command or the bufferTreeSynthesis command to fix high-fanout nets.
STA is signoff , Where as your logic synthesis is optimization tool(either DC or RTLC(from cadence). We run Pre-layout STA to check the correlation between the constraints used during the Logic synthesis and STA tools. One of the precautions to take is, make ideal nets for high fanout nets else it will show lot of (...)
place_opt does placement + optimization, so yes, it will add buffers in the design to fix design rule violations (max_cap, max_trans), add in buffertrees for high fanout nets, and to help fix timing violations
Hi friends, We know Clock is not synthesized at synthesis, but only after placement. I want to know why clock needs to be synthesized separately? In addition to this, before signal routing is done, clock is routed. why? even high fanout nets are also routed before any other nets. why? Any detailed explanation is (...)
Why high fanout of test clock will result in IR drop issue? Thanks in advance.
HFNS is same as ur pre cts ideally the fan out nets are kept as very high right....... so in pre cts wt happens is we check for the reset pins pins which is nothing but ur HFNS where as CTS is for the actual clock correct me if i am wrong
hfns is high fanout net synthesis usually v will do for high fan out nets like reset and scan
A Virtex-4 is pretty fast, but a high-fanout signal can slow down a route and can cause timing trouble. The faster the clock, the less fanout you want. Your design may have combinatorial logic feeding the high-fanout signal. If that's true, try modifying your design so the (...)
For large fanout nets, use set_ideal_network. This should be done during synthesis, before running clock tree sythesis. During CTS you also need to buffer your high fanout nets. set_false_path on a pin/port/net is used when you don't care about timing through that path. set_disable_timing is used for (...)
I want to ask this question too. For the pre-layout power analysis, someone suggests to use "set_load" command to specify the amount of capacitance on the high fanout nets such as clock net. However, how to get the capacitance value set for the clock net? Added after 8 minutes: Below is the way to calcua
Incase of high fanout nets reported using report_net, what should be done ? is there a way to change the number of fanouts in a net?
what is the need of driver cell in CTS Get clocks and high fanout nets excluded from being "attachIOBufed" They will get IO buffers during feCts using Add driver cell please explain the above 2 lines in detail thanks
A driver Cell in CTS is a point at which a brch of a clock is propagated.. or say a new start point of a the brances emerging from that point will all be time syncronized wrt the output of this driver cell. Regarding " Get clocks and high fanout nets excluded from being "attachIOBufed" They will get IO buffers during feCts us
hi all, what is the need to dump the single fanout& high fanout nets,is there any use,i mean we can get any thing from that. and what is tri state sytate cell& what is the use of that thanku
Generally buffering of nets in layout is refered to as high-fanout-net synthesis rather than CTS. The answer to your question is: remove the two constraints AFTER high-fanout-net synthesis
For high fan out nets, a lot of buffering may have been inserted for .18. But as you set_dont_touch for .13, that buffering may not have been inserted, resulting in a smaller design.
Warning: Design 'top' contains 2 high-fanout nets. A fanout number of 1000 will be used for delay calculations involving these nets. (TIM-134) Is there any command to list which nets have high fanout? thanks
Warning: Design 'top' contains 2 high-fanout nets. A fanout number of 1000 will be used for delay calculations involving these nets. (TIM-134) How to eliminate this warning? use command set_max_fanout? thanks in advance
Hi, In asic design how are high fanout nets handled?What i mean is do we need to work on it separately for signals like reset etc as we do for building clock tree.Any idea how magma handles high fanout nets?Also any special care to be taken while doing synthesis with regard to these (...)
there are 2 usages of buffer: 1) timing: to adjust the delays of nets 2) driver: you may need insert buffer to drive high fanout net.
hi if we consider the internal logic inside an FPGA....normally how many inputs can be driven by a FF..and on what factor does it depends. when does register duplication happens... thanks Routing Resources is the limiting factor. If you have high fanout nets, you will end up with large routing delays. XIlinx t
For clock nets, we use layout tools to generate clock tree. How about other high-fanout nets such as "reset" nets?