What is cell based design?
Cell-based methodology — the general class to which standard cells belong — makes it possible for one designer to focus on the high-level (logical function) aspect of digital design, while another designer focuses on the implementation (physical) aspect.
What is cell characterization in VLSI?
Cell library characterization is a process of analyzing a circuit using static and dynamic methods to generate models suitable for chip implementation flows. Knowing the logical function of a cell is not sufficient to build functional electrical circuits.
How are standard cell libraries designed?
Before including a standard cell into standard cell library, the cells are gone through schematic design, simulations followed by Symbol creation, layout design (as per standard cells layout rules), physical verifications, abstraction, extraction and characterization.
What is technology library in VLSI?
Technology library is a collection gates along with characteristics information of it. Technology libraries are provided by fabrication house (such as TSMC, UMC etc.) based on technology of manufacturing.
What is cell delay in VLSI?
Cell delay is the amount of delay from input to output of a logic gate in a path. In the absence of back-annotated delay information from an SDF file, the tool calculates the cell delay from delay tables provided in the logic library for the cell.
What is NDM in VLSI?
Normal Disconnect Mode (NDM) When two IrDA standard compatible devices come into range they must first recognize each other. The basis of this process is that one device has some task to accomplish and the other device has a resource needed to accomplish this task.
What is .DB file in VLSI?
db formatted library where all the cells are in a single binary file. With a . db library, the entire library has to be read into memory. In the Milkyway Environment, the Synopsys tool loads the library data relevant to the design as needed, reducing memory usage.
What is the difference between IP and macro in VLSI?
IP stands for instruction pointer, it is basically a pointer that store the memory location i.e. address of instruction to be executed . Whereas macros are some constant or fixed values that are used repeatedly in code. When code compile, these macros are replaced by their corresponding constant value.
What are the 3 categories of ASIC?
Gate Array Based ASIC are of three types. They are Channeled Gate Array, Channel less gate array and a structured gate array. In this type of gate array, wiring space is left between rows of transistors.
How do you reduce cell delay?
- Decrease the output load of that cell.
- Improve the transition time of signal which is input to that cell.
- You can use LVT cells ( Transistors with lower threshold voltages) they have less delay but more leakage power.
- Sizing also helps you to play with the delay.
- More the voltage, cell delay will be less .
What is DEF and LEF?
LEF is used in conjunction with Design Exchange Format (DEF) to represent the complete physical layout of an integrated circuit while it is being designed. LEF originated by Tangent for their Place and Route (P&R) tools, which were bought by Cadence Design Systems.
How to wrap table cell content using CSS?
There are two methods to wrap table cell content using CSS which are given below: Using word-wrap property: This property is used to allow long words to break and wrap onto the next line. Using word-break property: This property is used to specify how to break the word when the word reached at end of the line.
What is the use of overflow wrap in CSS?
overflow-wrap. The overflow-wrap CSS property applies to inline elements, setting whether the browser should insert line breaks within an otherwise unbreakable string to prevent text from overflowing its line box. Note: In contrast to word-break, overflow-wrap will only create a break if an entire word cannot be placed on its own line without
What is the Excel wrap text feature?
The Excel wrap text feature can help you fully display longer text in a cell without it overflowing to other cells. “Wrapping text” means displaying the cell contents on multiple lines, rather than one long line.
Is it possible to wrap flex items onto new lines?
There is however the ability to wrap flex items onto new lines, creating new rows if flex-direction is row and new columns if flex-direction is column. In this guide I will explain how this works, what it is designed for and what situations really require CSS Grid Layout rather than flexbox.