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Standard Cells Routing

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24 Threads found on edaboard.com: Standard Cells Routing
I was asked about the tracks and how to generate them. So I did a quick search online. Now my basic understanding is that, tracks are not any physical wires or cells. They are paths in which the routing tool can put wires. I am not sure exactly when tracks are generated. My guess is: (1) standard cells are first put in (...)
No matter how many levels, you want to impose the fewest routing barriers. Sometimes you will see poly used as local interconnect (or crossunders), even, although this is frowned upon generally. Even a small bit of (say) metal2 in a few standard cells can have a ripple effect making a lot of lines dodge it, and each other, adding to both (...)
Hello all, Can anyone say me why the gate pitch fixed in the standard cell layouts.
i am working in analog layouts but need to learn about the std cell development process. So can anybody please help me with this question?
Hi.. I am designing a standard cell library in 180nm technology using cadence virtuoso tool. How to decide the width of the power rails for these standard cells? please help me...
With vdd! gnd! you mean these are inherited power terminals ? Hi yes they are, net name gnd! and pin gnd!, same for the vdd! globalNetConnect performed. In addtion, I also get the following warning message with sroute: (sroute performed before placement) Begin power routing ... **WARN: (ENCSR-1253): Ne
You can create power structure first, but you cannot do route power to your standard cells until you place your standard cells. Thanks.
It depends on what technology you are going to synthesize for and the standard cells you use. There are ultra high density cells, which can make an area footprint way smaller than you can achieve by FPGA. ASIC only make sense if it is a bulk production.
Hi everyone, When I invoke VCAR tool to auto routing connection among standard cells from avst_n18_sc_tsm_c4 library unfortunately do not appear any path line in VCAR tool and I cannot use this tools to auto route. I would appreciate it if someone helps me to solve this problem. I am looking forward to hearing your experiences (...)
Hi Pavan, 1. Macros are aligned such that the pins, pin orientation, channel between memories, any extra spacing to be left around, their power source are taken care. Overall the macro placements have to give close to rectangular space for the standard cells. Secondary issues have to be taken care with placement and routing blockages and (...)
I made a T-flipflop by using RTL_compiler and Encounter, export it to GDSII file, and run DRC on virtuoso. However, this layout cannot pass the DRC. This is because the distance of standard cells are too close, so it cannot satisfy minimum distance between P-well and N-well. In addition, the via in power routing are not made on virtuoso (...)
Using SoCE after sometime. have an issue. I have a verilog netlist in which an SRAM module is instantiated. The power supply name of SRAM in the netlist & in SRAM LEF is ramvdd, ramgnd. For the standard cells, the power supply in LEF file is vdd! & gnd! Now while routing I need to connect for vdd! and ramvdd to a single PIN/NET . (...)
Why is global routing for standard cells sometimes preferred in Metal 2 layer? Although higher metals have lesser resistance, could adding vias to go to upper layers increase parasitics?
Congestion in general referred to routing. Placement congestion is due to overlap of standard cells, it is called overlapping rather than called as congestion. routing congestion is difference between supplied and available tracks. A track is nothing but a routing resource. Tracks fill the entire (...)
Hi folks, Instead of using standard cells, i want some custom cells to be used in placement and routing of a design. Is there any tutorial or way to do that. Also if i want certain specific standard cells to be used, how can i do that in Cadence Encounter. Any pointers, (...)
HI, can any one tel me the command which will report me standard cell area, macro area, and Total cells area in ASTRO thanks jagan
There is one input for floorplanning and we have specifications like core to i/o distance , core utilization and so on .. The output file for floorplan is the DEF file For placement we need to have standard cells, before this placement we need to put a special route for Std cell rows...,Connecting global nets such as Vdd and Vss..same DEF file
Filler cell is used to maintain the Nwell continuity in the standard cell so if u add filler cells before routing it provides decoupling capacitance and if u add after routing the tool will check for the DRC.... It is basically to maintain the continuity and to fill the gaps in the rows of the standard (...)
You need to have those metal lines because you want to stack the standard cells for area optimization. You can argue that if you layout the transistors of the standard cell in a certain way maybe area optimization of the standard cell may be better, i dunno. but convensionally, it is more optimal area wise for the (...)
hi, what's the reason for timing violation? and I think before post-clock we should focuse only on setup fixing. and where is you violation path located ? memory or hare macro ? if so, adjust your floorplan. and if you vio path located in standard cells , just check the topo of routing and check if it's reasonable.


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