What is DRV in physical design?

DRV(Design Rule Violations) and DRC(Design rule check) are the terms used judge the quality of chip in different stages in VLSI Physical Design. DRC: It is actually used for making sure layout of a design must be in accordance with a set of predefined technology rules given by the foundry for manufacturability.

What is DRC in physical design?

Design Rule Checking (DRC) verifies as to whether a specific design meets the constraints imposed by the process technology to be used for its manufacturing. DRC checking is an essential part of the physical design flow and ensures the design meets manufacturing requirements and will not result in a chip failure.

What are DRV violations?

DRV is design rule violation. If the rules or design is violated or the gap between metals is less than the required, it is violation of design rule. These DRCs are required to make a regular and proper functional designs.

How do you fix a DRV violation?

The best approach to fix DRV's is through implementation tool. One should try to get fixed as many as possible at implementation time only so that there is minimum work to be done manually. However, since, all the modes are not visible at the implementation tool, there are still a few of DRVs left to be fixed manually.

What is DRC and LVS?

DRC is a major step during physical verification signoff on the design, which also involves LVS (layout versus schematic) checks, XOR checks, ERC (electrical rule check), and antenna checks.

What is ERC check?

Electrical rule checking (ERC) is a methodology used to check the robustness of a design both at schematic and layout levels against various “electronic design rules”. These design rules are often project-specific and developed based on knowledge from previous tapeouts or in anticipation of potential new failures.

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How will you fix DRV?

The best approach to fix DRV’s is through implementation tool. One should try to get fixed as many as possible at implementation time only so that there is minimum work to be done manually. However, since, all the modes are not visible at the implementation tool, there are still a few of DRVs left to be fixed manually.

What is max cap violation?

The capacitance on a node is a combination of the fan-out of the output pin and capacitance of the net. This check ensures that the device does not drive more capacitance than the device is characterized for. The violation can be removed by increasing the drive strength of the cell.

How do you fix a max transition?

How to fix max trans violation?
  1. Increase the driver size.
  2. Break the nets in the case of long nets.
  3. Break the large fanout by duplicating drivers or with buffering.
  4. Change the VT if option available(changing drivers from hvt to svt or lvt).
How to fix max trans violation?
  1. Increase the driver size.
  2. Break the nets in the case of long nets.
  3. Break the large fanout by duplicating drivers or with buffering.
  4. Change the VT if option available(changing drivers from hvt to svt or lvt).

What is a Runset?

The DRC runset (or “DRC deck”) is a set of instructions that scan and process physical design shapes with the purpose of detecting violations of design rules for a specific fabrication technology.

What is stick diagram?

stick diagrams are a means of capturing topography and layer information using simple diagrams. Stick diagrams convey layer information through colour codes (or monochrome encoding). Acts as an interface between symbolic circuit and the actual layout.

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What is perc in Calibre?

Calibre® PERC™ The Calibre PERC platform is the industry leader for reliability verification solutions, enabling a vast range of IC circuit reliability checks that are not possible with traditional physical verification tools.

What is a refundable tax credit?

What Is a Refundable Tax Credit? A refundable tax credit can be used to generate a federal tax refund larger than the amount of tax paid throughout the year. In other words, a refundable tax credit creates the possibility of a negative federal tax liability.

How do I fix max fanout?

To fix fanout violation, split the maxfanout load by adding buffer.. you can write your own script to fix this.. consider you are having a maxfanout of 20 in a cell named “add1” but real maxfanout should be 11.

How do you fix DRVs?

The best approach to fix DRV’s is through implementation tool. One should try to get fixed as many as possible at implementation time only so that there is minimum work to be done manually. However, since, all the modes are not visible at the implementation tool, there are still a few of DRVs left to be fixed manually.

What is clock transition time?

There are two types of process synchronization: synchronous or periodic, also called Time-triggered (where a clock transition is the trigger to move information across a communications network) and asynchronous or aperiodic also called Event-triggered, (where specific Event signals act as the triggers to change State).

What is DRC error?

Electronic design automation software lets you know when a design margin is violated by stating the parameter that is out of the acceptable range. This is called a DRC error and it helps eliminate rework in the production stage.

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What is half DRC rule?

1/2 Design Rule Spacing

The keep out area for each layer should extend for one half of one design rule distance beyond the edge of the cell. Internal elements within the cell should be at least one half of one design rule distance inside the cell boundary.

Which layer is used for power and signal lines?

6. Which layer is used for power and signal lines? Explanation: Metal layers are used for power and signal lines as metals has good thermal and electrical conductivity.

Which color is used for implant?

Which color is used for implant? Explanation: Yellow color is used to represent implant layer.

What is ERC check in layout?

Electrical rule checking (ERC) is a methodology used to check the robustness of a design both at schematic and layout levels against various “electronic design rules”. These design rules are often project-specific and developed based on knowledge from previous tapeouts or in anticipation of potential new failures.

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