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31 Threads found on edaboard.com: Star Routing
Hi There r different types of topologies like Daisy chain, star, remote star, H-shape and user can also create his own topologies. Topologies r nothing but how u place different components on the PCB and route them so that the signal reaches its destination without any loss and the circuit behave properly. One topology might work for one
If it is 2stage flash ADC, it should be fast ADC, isn't it ? So, single ended is a non-sense, because the digital will make a lot of noise that will come on to signal. If you keep on working with single ended, split as much as you can analog and digital, especially within the ADC. Split the power supplies, use star-routing. Finally fill any blank
I have 4 SD-RAMs that is supposed to be connected to FPGA. my questions: 1. what is preferred? star or daisy-chain? 2. how I do route the shared data/address bus? 3. which termination resistors I nee??? where I should place them?
you already askede in this topic: star topology or daisy chain.
Hello board, I want to route a signal between 2 adjacent boards(track length is about 6 inch), output of board A will be input of board B. I deally I do not want to have difference between level of these two signals more than 10uV in two different boards. though I have used star configuration of GND and thick GND tracks(60 mil) for each board but G
Hello, How can we select which topology should be used i.e., whether star or Daisy Chain in a specific DDR2 on board PCB routing? Pls comment. Rgds, sandhya
The link below describes the types of routing techniques and the advantages of each topology. If you are using star topology than you have to match lengths beetween all the traces meeting at the main VIA and also use termenations (if required) at all the ends. In daisy chain u dont need to do
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
hi all, do we need a netlist for the starRc extraction?..and what is the use of LEF file in star RC extraction
Dear all, i know that i should be carefull in the way i route vdd and vss, but that's all i know, can somebeody give me the big issues with routing vdd and vss ps: it's an analog block i have heard about ground planes star connections, avoiding supply loops , can somebody clarify for me those concepts or/and give a good reference or link abou
Pls keep large current path short and straight. Then connect small-signal ground to true ground by star connection with narrow wire.
Hi all, I am using DDR3 in Flyby Topology but due to space constarint in board I have to place my DDRs one over another. What I need to know is can I place DDR3 in this way and have the connection of addr,command and control signals in star topology (like we do in DIMM modules) or do I need to maintain flyby topology for that. The addr, cmmd an
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Try to make ground on bottom and VCC on TOP layer. Keep in mind that you need to use star topology to distribute POWER or ground to each element.
Thanks a lot mate. Actually i am using cadence First encounter for routing. Now for doing manual routes for PLL's i was told to do routing in star formation. So thats why i was totally confused as to why this requirement was there. If any one else can comment it would be very much appreciated Ehh... you design PLL-
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. *
Actually not .. power and ground planes are two different things .. Power routing with a star topology, and proper decoupling of the power(Vcc) pins will help achieve the best RF performance possible .. However, a single solid ground plane in a multi-layer stack-up board works well. The general rule is to avoid cross-interference by using a gro
1. check starRC user manual for TLUplus model generation. usually it is from .nxgrd file, which is ASCII file from your pdk. (while .itf is binary mode). 2. using Astro to generate sdf is not the usual design flow, and TLU model can be quite inaccurate compared to TLUplus model. Regards.
If you are routing in single/double side PCB go for star or Multi drop routing topology. Avoid Daisy Chin. You dont have to worry in case of Multilayer board.Vcc Plane takes care of it. Good Luck
It is generated by extraction tools like star-RCXT from place-n-route database of a fully laid out and routed design. It can also be generated without layout/routing by syntheisis tools using placement aware methodology ( like DC - topographical). But those are just first cut estimates and would be off from actual parasitics that you'll get in
Some of the care that should be taken while designing PCB are as follows - 1. Use high frequency decoupling capacitor and place it close to the IC between Vdd and Gnd. Use tantalum capacitor for decoupling. Use capacitance 0.1 F for frequency less than 5 MHz and 0.01 F for above 5 MHz frequency. 2. Place another bulk capacitor in parallel
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
I am routing a address line A0. It comes from the processor and connected to 2 DDR2 modules.i am following star topology. So I scheduled nets and formed a T junction.Now what i have to do is to match the length to each of the DDR2 what could be done to match the entire T connection. Pls reply sandhya
On Semiconductor is the leader for ECL and PECL components. They took over the product line formerly run by Motorola. Go to and search for PECL. You will find numerous design guides. You can fanout PECL. However, the routing must be daisy-chained with the termination resistors at the far end. Most common mistakes
Hi, In my PCB design, Layer 1: Top Layer (RF Signals) Layer 2: Mid 1 Layer (GND Plane) Layer 3: Mid 2 Layer (Power tracks in star configuration) Layer 4: Bottom Layer (Signals and GND plane) Should I give multiple vias for Vcc pads in top layer to connect them to inner power routing, the same way where we use multiple vias for
Hi I'm trying to design a pcb to be used with my ADC converter. My chip is smd and when i tried to use a dip adapter which was inserted to a dip socket i had too much noise (i used wires below the socket, no pcb), I had separate regulators for analog-digital, star ground etc. I read that ground plane helps a lot but there is also a ground fill
you'd probably have to go with something more akin to ATM. PCIe may also be an option. The issue with switched low latency is that the message lengths must become short. eg, if 20 ASICs need to communicate a 1B message, you already have a worst case of 20*8b of latency (plus at least enough time to do the addressing). for 1kB packets, this beco
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
At times when you didn't have automatic clock generation software available (where you can tell the software how much difference you can tolerate between the local CLK/CLKB input nodes) I used the following scheme: Generate most possible symmetric CLK/CLKB signals and buffer them locally and symmetrically, then route them together (in parallel) to
Looks like ur data bus is not point to point?Is it correct? If it is point to point then follow below points,otherwise ignore it. Place components one above other (top & bottom). routing is not possible with two layers.you need to use multilayer for DDR routing.. routing topology is star. Length matching is (...)
hai friends, Am just a learner in allegro 16.3,i just know how to route but not design is looking horrible.can any one explain me how to use the topological routing like chain,daisy,star,etc for a common board.