Core_EDA

# IR analysis

## [[Reference Flow]]

## IR drop analysis Background:

You can check "Inside SPICE engine" section of [[SPICE_for_lib_and_package]] (lect07_element_stamping.pdf)

So that you can get a brief idea of Nodal Analysis

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## IR drop analysis Basics

 Check IR drop analysis core engine in attachment:"IR_drop_analysis_and_validation.pptx" 

 Check IR drop analysis code flow in attachment:"IR_drop_analysis_and_validation2.pptx"  

 Static IR analysis with circuit partition attachment:"IR_drop_analysis_and_validation3.pptx"  

 xGraph-pGraph structure and flow (by 冯叩倩叩 attachment:"xgraph_pgraph.pptx"

 pGraph construct (By 000 ) attachment:"node_build.pptx"

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## [[Dynamic IR analysis]] 

## [[Chip_Package_Co-Simulation]]

## [[High Performance IR Analysis]] 

## [[timing window file (twf)]]

## [[Custom Model EMIR (Memory, I0, PAD, IP)]] 

## Known issues

* Vector-less IR is not tested

* gp and pl will call vector-less IR, but not tested

* If clock is not specified, min clock will selected, but cells do not belong to that clock will not switch (Not align with ref tool)  

* Vector-less flow also accept VCD?

## Project feature list

| | | |

|--|--|--|

| Supply model support for dynamic IR drop analysis | QHH 202010 | attachment:"supply_model.pptx" |

|Circuit partition for static IR  | DTH 202103 | TBD |

|Circuit partition for dynamic IR | DTH 202103 | TBD |

|GSS for static IR  | DTH 202103 | TBD |

## gu class definition

| | |

|--|--|

|guXform|to scale, rotate graphic object|

|guPoint|point graphic object|

|guRect|Rectangle graphic object|

|guTrect|??|

|guTrapz|trapezoid graphic object, only accept four points|

|guPointlist|point list|

|guPolygon|Polygon shape|

|guScanline|to handle concave or convex shape|

|guPolyPath|??|

|guTrapzlist|trapezoid list|

|guGrid|Create point grids within an area, length|

|guBin|Binary search to locate a shape|

|guMask|Shape and, or, not operation|

|guPattern|??|