Total Pageviews

Monday, 16 April 2012

Diff between global hard keep out and soft keep out?

Hard Blockage: placement blockage used to block the placement of cells around the macro with specific offset from macro boundaries (4 sides)..

Soft Blockage: It is kind of placement blockage used to block the placement of cells around the macro with specific offset from macro boundaries.. but can allows the cell placement of cells during placement optimization & placement legalization..

Here Global refers to all the macros in the design with fixed attribute...

Thursday, 5 April 2012

blog sites

Multi-Corner Multi-Mode

What's MCMM
MCMM stands for: Multi-Corner Multi-Mode (static timing analysis used in the design of digital ICs)

What's a Mode
A mode is defined by a set of clocks, supply voltages, timing constraints, and libraries. It can also have annotation data, such as SDF or parasitics files.
Many chip have multiple modes such as functional modes, test mode, sleep mode, and etc.

What's a Corner
A corner is defined as a set of libraries characterized for process, voltage, and temperature variations.
Corners are not dependent on functional settings; they are meant to capture variations in the manufacturing process, along with expected variations in the voltage and temperature of the environment in which the chip will operate.

complete knowledge on STA follow below link

http://wenku.baidu.com/view/818eefdace2f0066f533228a.html?from=rec&pos=1&weight=8&lastweight=3&count=5