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Showing posts from March, 2023

Regular Pattern Search Using grep, awk and sed

Hello, Dear Readers,   In this post, I will share some deep insights into regular pattern searching using grep, awk, and sed. In VLSI/EDA flows, engineers frequently work with large Innovus, Voltus, STA, EMIR, synthesis and simulation reports. Linux commands such as grep , awk , and sed provide a fast way to search, filter and process this data without opening huge files manually. 1. Regular Expressions: A regular expression (regex) defines a pattern for searching text. Common patterns: Pattern Meaning Example . Any character V.D * Zero or more ab* + One or more ab+ [0-9] Digit U [0-9] [a-z] Lowercase [a-z] + ^ Start of line ^VDD $ End of line VDD$ ` ` OR `VDD VSS` For example: grep -E 'ERROR|WARNING|FATAL' voltus.log Searches for any of the three patterns. 2. grep — Search and Filter: grep is mainly used to find matching lines . Basic search grep 'VIOLATION' report.rpt Case-insensitive search grep -i 'error' run.log Show line numbers grep -n 'VIOLATION...
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Exploring the Role of LEF Files in VLSI Chip Design: A Beginner's Guide

Hello Dear Readers,   Today in this post, I will provide some deep insight into the LEF file role during the VLSI Chip Design process. In VLSI (Very Large Scale Integration) design, a LEF file is a file that contains information about the physical geometry of the standard cells used in a circuit. LEF stands for Library Exchange Format. A standard cell is a pre-designed logic cell that contains a specific function, such as a flip-flop or an AND gate. Standard cells are designed to be easily combinable and scalable to create more complex circuits. The physical geometry of each standard cell is defined in the LEF file. The LEF file contains information such as the width, height, and position of the pins and metal layers of each standard cell. It also contains information about the physical design rules that govern the placement of these cells on the chip. LEF files are important in VLSI design because they enable the interoperability of different design tools from different vend...
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What is RISC-V Microprocessor and Implementation using Verilog HDL Part-1

  Hello Dear Readers,   Today in this series of posts, I will provide some deep insight into the RISC-V microprocessor and its Implementation using Verilog HDL. RISC-V is an open-source instruction set architecture (ISA) designed for modern computer processors. It is a relatively new ISA that has gained popularity recently due to its flexibility, simplicity, and open-source nature. The name "RISC-V" stands for Reduced Instruction Set Computing - Five, which refers to the fact that it is based on a simple, streamlined set of instructions. One of the key features of RISC-V is its modular design, which allows for customization and scalability. This means that designers can choose which instructions to include and how to implement them, which can result in more efficient and specialized processors. Additionally, because RISC-V is open-source, it is free to use and can be modified by anyone, making it a popular choice for academic research and experimentation. RISC-V also incl...
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