Important Themes in Digital Design[转]

Important Themes in Digital Design

• Good tools do not guarantee good design, but they help a lot by taking the pain out of doing things right.
• Digital circuits have analog characteristics.
• Know when to worry and when not to worry about the analog aspects of digital design.
• Always document your designs to make them understandable by yourself and others.
• Associate active levels with signal names and practice bubble-to-bubble logic design.
• Understand and use standard functional building blocks.
• Design for minimum cost at the system level, including your own engineering effort as part of the cost.
• State-machine design is like programming; approach it that way.
• Use programmable logic to simplify designs, reduce cost, and accommodate lastminute modifications.
• Avoid asynchronous design. Practice synchronous design until a better methodology comes along.
• Pinpoint the unavoidable asynchronous interfaces between different subsystems and the outside world, and provide reliable synchronizers.
• Catching a glitch in time saves nine.

ECO

前提：综合时要keep hierarchy, 确保逻辑不被打散，做ECO时能快速定位到需要修改的地方。
步骤：
1. 修改rtl code，做rtl level 的simulation，确保修改思想是正确的
2. 查找netlist，定位到需要修改地方，理清周边逻辑，尤其是对于有clock gating的情况
3. 少量逻辑的增加可手动例化一些库单元，或写个module综合一下
4. 确保修改后逻辑和时序与预期的一致
5. Formal Check，可用LEC，比对netlist和rtl code的一致性，确保你netlist修改正确
6. gate level simulation
7. To backend

TSMC 0.25um spec-standard cell

下面为spec，如果需要db文件，请与我Email联系。
tsmc25.pdf
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