What are the differences between standard cell based Asics and gate array based Asics?

Both use the rows of cells separated by channels used for interconnect. One difference is that the space for interconnect between rows of cells are fixed in height in a channeled gate array, whereas the space between rows of cells may be adjusted in a CBIC. Only the interconnect is customized.

What is a standard cell in Virtuoso?

Standard cell layout simply means that all standard cells – nand, nor, not, etc. The main purpose of this tutorial is to you how to use Virtuoso Layout Editor and create a layout of an inverter that could be used in a standard cell library. The tutorial also includes instructions on checking (DRC and LVS) the layout.

What are the different types of ASIC?

Gate Array Based ASIC are of three types. They are Channeled Gate Array, Channel less gate array and a structured gate array.

What is the standard cell library characterization?

What is standard cell library characterization? Cell library characterization is a process of analyzing a circuit using static and dynamic methods to generate models suitable for chip implementation flows.

What are the advantages of ASIC?

ASICs can offer greater performance, lower power, higher voltages, reduced footprint/bill of materials and thus increased reliability. Also important, ASICs offer higher IP security, as an ASIC is far harder to reverse engineer than a microcontroller or FPGA design, where the IP is stored in easy-to-read memory.”

What is standard cell library in VLSI?

Standard cell library is a collection of well defined and pre-characterized logic cells with multi-drive strength and multi-threshold voltage cells in the form of a predefined standard cell layout.

What is PR boundary in VLSI?

The PR boundary is the layer that the place and route tools will use for placing the cells next to each other. So if you have overlapping ground and vdd lanes it can be that you have the contacts put in such a way that they half above and half below the PR boundary.

What is a standard cell in VLSI?

A standard cell is a group of transistor and interconnect structures that provides a boolean logic function (e.g., AND, OR, XOR, XNOR, inverters) or a storage function (flipflop or latch).

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.

What is standard cell library in ASIC design?

Standard cell library is an integral part of ASIC design flow and it helps to reduce the design time drastically. Standard cells used in the ASIC design is a part of a standard cell library along with some other file sets. In this article, we will discuss the important content inside the standard cell library and its uses.

What is a standard cell?

Standard cells are well defined and pre-characterized cells used in ASIC (Application Specific Integrated Circuit) Design flow as basic building blocks. All these cells are equal in height and can easily fit into the standard cell row. Standards cells are highly reusable and save lots of ASIC design time.

What is standard cell methodology in semiconductor design?

In semiconductor design, standard cell methodology is a method of designing Application Specific Integrated Circuits (ASICs) with mostly digital-logic features. Standard cell methodology is an example of design abstraction, whereby a low-level VLSI-layout is encapsulated into an abstract logic representation (such as a NAND gate).

What are the advantages of using standard cells for APR?

Easy placement for APR tool: All the standard cells have the same height and easily can be fit into the standard cell row so make it easy for APR (Automatic Place and Route) to place them. They also have power rails in the same location for all the standard cells, so power rails can also be abutted easily.