What is soft bound in VLSI?

Soft bound is the default option of the tool, with no guarantee that the cells will be places in the bound or not. In -exclusive option, It force the placement of the specified cells inside the bound. All other cells must be kept outside the bound, only the cells which are specified will come inside the bound.

What is bounds in VLSI?

Placement bounds: It is a constraint that controls the placement of groups of leaf cells and hierarchical cells. It allows you to group cells to minimize wire length and place the cells at most appropriate locations.

What is Diamond bound in VLSI?

To create a group bound, use the -dimension option. o Diamond bounds are region constraints centred on a specific object, which can be fixed or floating.

What are reasons of congestion in the design?

What are the reasons for Congestion?

• High Standard cell density in small area.
• Placement of standard cells near macros.
• High pin density at the edge of macro.
• Bad floorplan.
• During IO optimization tool does buffering, So lot of cells placed in the core area.

What is fence in VLSI?

Fence : This is a hard constraint specifying that only the design module can be placed inside the physical boundary of fence. No outside module logic can be placed inside the fence boundary. Halo : The halo/obstruction is the placement blockage defined for the standard cells across the boundary of macros.

What is Partitioning in VLSI design?

Partitioning can be done in the RTL design phase when the design engineer partitions the entire design into sub-blocks and then proceeds to design each module. These modules are linked together in the main module called the TOP LEVEL module.

What is partial blockage in VLSI?

Partial Blockages: Sono cells can be placed in that region, but the exibility ofblockages can be chosen by Partial Blockages. To reduceplacement density without blocking 100\% of area,changing the blockage factor of an existing region to exible value will be a better option.

What is routing congestion in the design?

Source: Arteris customer design. Wire routing congestion occurs on a system-on-chip when a lot of wires (or metal lines) are routed in a narrow space. It becomes prevalent in the on-chip interconnect fabric because it must be routed in the floorplan “white space” between IP block restrictions.

What are the types of congestion in VLSI?

There are basically two types of congestion:

• placement congestion.
• Routing congestion.

What is tap cell in VLSI?

Well tap cells (or Tap cells) are used to prevent the latch-up issue in the CMOS design. Well tap cells connect the nwell to VDD and p-substrate to VSS in order to prevent the latch-up issue.

What is placement in VLSI?

Placement is the problem of automatically assigning correct positions to predesigned cells on the chip with no overlapping such that some objective function is optimized. Placement is design state after logic synthesis and before routing.

What is the difference between soft move bounds and hard move bounds?

– Soft move bounds specify placement goals, with no guarantee that the cells will be placed inside the bounds. – Hard move bounds force placement of the specified cells inside the bounds. – Exclusive move bounds force the placement of the specified cells inside the bounds. All other cells must be placed outside the bounds.

What is the difference between move bounds and Soft Bounds in ICC?

During placement, ICC ensures that the cells you grouped remian together. However, defining move bounds restricts placement and defining too many can lower QoR. Soft bounds are usefull for placement. During pla ekent of design you want to prioritize one of timing , area and power over another.

What is VLSI design?

VLSI Design 1. Part 1 – VLSI Basics. VLSI Design 2 Very-large-scale integration (VLSI) is the process of creating an integrated circuit (IC) by combining thousands of transistors into a single chip. VLSI began in the 1970s when complex semiconductor and communication technologies were being developed.

What is the difference between hard and exclusive move bounds?

– Hard move bounds force placement of the specified cells inside the bounds. – Exclusive move bounds force the placement of the specified cells inside the bounds. All other cells must be placed outside the bounds. Defining a move bound allows you to group cells to minimize wire length and place the cells at the most appropriate locations.