encounte里report timing后报出的density指的是什么

GordonYuan

encounte里report timing后报出的density指的是什么

GordonYuan

急求！

joemool

Use the queryDensityInBox command to get the density for a specific area in the design.

It is recommended that you use the queryPlaceDensity command for reporting the standard cell utilization. The standard cell utilization reported by the queryPlaceDensity command is calculated as:

( stdcell_area + block_area ) / alloc_area

where,

        stdcell_area = area_of_standard_cells + area_of_physical_cells (filler, Endcap, welltaps, power shutoff (PSO) and Decaps cells)

        block_area = area of the placed and unplaced blocks

        alloc_area = total_area_of_sites - area_of_blocked_sites

Note: The area of placed and unplaced blocks is zero if blocks are marked as FIXED . The FIXED blocks are not included in the calculation. The queryPlaceDensity command lists the block area if blocks are included in the standard cell utilization calculation.

Note: The following commands calculate the standard cell utilization using the same equation as queryPlaceDensity :

    checkPlace and checkDesign -place

    placeDesign

    timeDesign and optDesign (Does not use cell padding in the calculation for standard cell utilization)

    summaryReport

    dbFPlanRegRowDensity

    queryDensityInBox

icfbicfb

解释很专业， 赞一个，

joemool

回复 4# icfbicfb


    把DOC上的东西搬运一下而已。有些人不是懒么？哈哈哈

一朵云做的鱼

joemool 发表于 2015-2-28 12:23
回复 4# icfbicfb

求来源文档。这两天在看timeDesign，queryDensityInBox，queryPlaceDensity，报的density和utilization的区别，但是没有找到相关资料。哭死。。。

sunhongwei

我理解这俩是一个东西