Table of Contents
What is overlay in VLSI?
In silicon wafer manufacturing overlay control is the control of pattern-to-pattern alignment necessary in the manufacture of silicon wafers. Overlay control has always played an important role in semiconductor manufacturing, helping to monitor layer-to-layer alignment on multi-layer device structures.
What is core utilization in VLSI?
Core Utilization (Cu): It indicates the amount of core area used for cell placement. The number is calculated as a ratio of the total cell area (for hard macros and standard cells or soft macro cells) to the core area.
What is overlay in semiconductor?
Semiconductor pattern overlay is the measure of vector displacement from one process level (substrate) to another level (resist), usually separated by an intermediary (thin film) layer.
What is overlay metrology?
Overlay metrology involves a process of taking a multitude of measurements between two (or more) different layers. In simple terms, the overlay metrology system is taking various measurements, such as tool alignment accuracy, wafer/mask distortions and variation.
What is physical design?
The physical design is the process of transforming a circuit description into the physical layout, which describes the position of cells and routes for the interconnections between them.
What is module in physical design?
Modules are called as blocks, when it is assigned an appropriatre area and aspect ratio (Height[h]/Width[w]). In hard blocks, the area and aspect ratio of the blocks are fixed, whereas for soft blocks, the area is fixed but aspect ratio could vary. The placement of these blocks on a chip decides the size of the chip.
What is analog layout in VLSI?
Generally, analog design means circuit design. It involves converting specifications into transistor-level circuits, simulating, as well as verifying the design’s functionality and ensuring that it works on silicon.
What is utilization in physical design?
Concept of Utilization: Utilization is defined as the percentage of the area that has been utilized in the chip. In the initial stages of the floorplan design, if the size of the chip is unknown, then the starting point of the floorplan design is utilization.
What is row in VLSI?
Each row consists of a number of sites which can be occupied by the circuit components. A free site is a site that is not occupied by any component. Circuit components are either standard cells, macro blocks, or I/O pads. Standard cells have a fixed height equal to a row’s height, but have variable widths.