Hierarchical synthesis vs flatten synthesis

[chevuturi]

What are advantages and disadvantages when we use Hierarchical synthesis and flatten synthesis ?

 

[ThisIsNotSam]

runtime vs QoR (quality of results)

 

[chevuturi]

Could you please list more ?

 

[ThisIsNotSam]

I could, but it certainly would help if you had specific questions or thoughts. Unless.. is this an interview question?

 

[D.A.(Tony)Stewart]

Homework 101 DIY. Did you know Bing uses AI? even google.


in future learn to search

https://chat.openai.com/c/2d66f6de-883b-457c-b312-14f5b07fd931

What are advantages and disadvantages when we use Hierarchical synthesis and flatten synthesis ?


Hierarchical synthesis and flatten synthesis are two different approaches to logic synthesis in digital design. Each approach has its own set of advantages and disadvantages.

Hierarchical Synthesis:​

Advantages:​

1. Modularity: Hierarchical synthesis allows designers to break down a complex design into smaller, more manageable modules. Each module can be designed, verified, and optimized independently.
2. Reusability: Hierarchical synthesis promotes reusability of modules. Once a module is designed and verified, it can be reused in multiple projects, leading to time and effort savings.
3. Ease of Design: Designers can focus on specific modules without having to deal with the entire design at once. This can make the design process more straightforward and less error-prone.
4. Parallel Development: Different modules can be developed in parallel by different teams or designers, speeding up the overall design process.

Disadvantages:​

1. Interconnect Overhead: Hierarchical designs require interconnects between different modules, which can introduce additional delays and consume extra resources.
2. Hierarchy Management: Managing the hierarchy and ensuring proper communication between modules can be challenging. Careful planning and coordination are needed to avoid integration issues.
3. Limited Optimization: Global optimizations across the entire design may be limited, as optimizations are often done at the module level.

Flatten Synthesis:​

Advantages:​

1. Global Optimization: Flatten synthesis allows for global optimizations across the entire design, potentially leading to better overall performance.
2. Reduced Interconnect Overhead: Since the design is flattened, there is no need for interconnects between different hierarchical levels, potentially reducing delays and resource usage.
3. Simplified Design Flow: There is no need to manage hierarchy and coordinate between different modules, simplifying the design flow.

Disadvantages:​

1. Complexity: Flattening a design can result in a large, complex netlist that may be difficult to manage, understand, and debug.
2. Limited Reusability: Components of the design may be less reusable, as they are tightly integrated into the overall netlist.
3. Increased Compile Time: Flattening can lead to longer synthesis times due to the increased complexity of the design.

In practice, the choice between hierarchical and flatten synthesis depends on the specific requirements of the project, design complexity, and the trade-offs between modularity and global optimization. Designers often use a combination of both approaches, leveraging the strengths of each in different parts of the design.

But then Verify before trusting 100%

 

[dpaul]

Homework 101 DIY. Did you know Bing uses AI? even google.


in future learn to search

https://chat.openai.com/c/2d66f6de-883b-457c-b312-14f5b07fd931

What are advantages and disadvantages when we use Hierarchical synthesis and flatten synthesis ?


Hierarchical synthesis and flatten synthesis are two different approaches to logic synthesis in digital design. Each approach has its own set of advantages and disadvantages.

Hierarchical Synthesis:​

Advantages:​

1. Modularity: Hierarchical synthesis allows designers to break down a complex design into smaller, more manageable modules. Each module can be designed, verified, and optimized independently.
2. Reusability: Hierarchical synthesis promotes reusability of modules. Once a module is designed and verified, it can be reused in multiple projects, leading to time and effort savings.
3. Ease of Design: Designers can focus on specific modules without having to deal with the entire design at once. This can make the design process more straightforward and less error-prone.
4. Parallel Development: Different modules can be developed in parallel by different teams or designers, speeding up the overall design process.

Disadvantages:​

1. Interconnect Overhead: Hierarchical designs require interconnects between different modules, which can introduce additional delays and consume extra resources.
2. Hierarchy Management: Managing the hierarchy and ensuring proper communication between modules can be challenging. Careful planning and coordination are needed to avoid integration issues.
3. Limited Optimization: Global optimizations across the entire design may be limited, as optimizations are often done at the module level.

Flatten Synthesis:​

Advantages:​

1. Global Optimization: Flatten synthesis allows for global optimizations across the entire design, potentially leading to better overall performance.
2. Reduced Interconnect Overhead: Since the design is flattened, there is no need for interconnects between different hierarchical levels, potentially reducing delays and resource usage.
3. Simplified Design Flow: There is no need to manage hierarchy and coordinate between different modules, simplifying the design flow.

Disadvantages:​

1. Complexity: Flattening a design can result in a large, complex netlist that may be difficult to manage, understand, and debug.
2. Limited Reusability: Components of the design may be less reusable, as they are tightly integrated into the overall netlist.
3. Increased Compile Time: Flattening can lead to longer synthesis times due to the increased complexity of the design.

In practice, the choice between hierarchical and flatten synthesis depends on the specific requirements of the project, design complexity, and the trade-offs between modularity and global optimization. Designers often use a combination of both approaches, leveraging the strengths of each in different parts of the design.

But then Verify before trusting 100%

I would have stopped after posting the link, and would not give out the results here.
Let those newbies do some work!

 

[D.A.(Tony)Stewart]

I would have stopped after posting the link, and would not give out the results here.
Let those newbies do some work!

I was feeling sorry for them not knowing how to "fish" or use openai chatgpt3.5

Historical info like this is impressive. But still could include errors.

Any newb who cannot search for easy stuff is at a serious disadvantage.