新手请教：为什么用.18工艺综合出来的面积比.35还大？

首先DC综合报告的面积单位是什么?
另外DC报告中的连线面积说明了什么?为什么一个工艺库出来的连线面积比例很小，另一个却很大?
同样的设计，用Chartered 0.18工艺库综合出来的面积比0.35工艺库的面积还大，下面是DC的面积报告
首先是.35的：
Library(s) Used:
CSM35OS142_typ (File: /home/tian/work/design_compiler/library/synopsys_35/models/CSM35OS142_typ.db)
Number of ports:8
Number of nets:318
Number of cells:217
Number of references:26
Combinational area:706.900003
Noncombinational area:450.660000
Net Interconnect area:490.344310
Total cell area:1157.560003
Total area:1647.904313
Hierarchical area distribution
------------------------------
Global cell areaLocal cell area
---------------------------------------------
Hierarchical cellAbsolutePercentCombi-Noncombi-Black
TotalTotalnationalnationalboxesDesign
---------------------------------------------------------------------------------------------
single_loop1157.5605100.0173.2502450.66000.0000single_loop
add_0_root_add_0_root_add_37_275.13006.575.13000.00000.0000single_loop_DW01_add_3
add_1_root_add_0_root_add_37_2115.330010.0115.33000.00000.0000single_loop_DW01_add_4
add_1_root_sub_0_root_add_33104.53019.0104.53010.00000.0000single_loop_DW01_add_5
add_34119.330010.3119.33000.00000.0000single_loop_DW01_add_1
add_35119.330010.3119.33000.00000.0000single_loop_DW01_add_0
---------------------------------------------------------------------------------------------
Total706.9003450.66000.0000

然后是.18的
Library(s) Used:
scx_csm_18ic_tt_1p8v_25c (File: /home/tian/work/design_compiler/library/synopsys_18/scx_csm_18ic_tt_1p8v_25c.db)
Number of ports:8
Number of nets:246
Number of cells:138
Number of references:29
Combinational area:7361.323257
Noncombinational area:5059.454521
Net Interconnect area:73640.381165
Total cell area:12420.777779
Total area:86061.158943
Hierarchical area distribution
------------------------------
Global cell areaLocal cell area
-----------------------------------------------
Hierarchical cellAbsolutePercentCombi-Noncombi-Black
TotalTotalnationalnationalboxesDesign
-----------------------------------------------------------------------------------------------
single_loop12420.7852100.0791.68315059.45510.0000single_loop
add_0_root_add_0_root_add_37_2804.98886.5804.98880.00000.0000single_loop_DW01_add_3
add_1_root_add_0_root_add_37_21580.039612.71580.03960.00000.0000single_loop_DW01_add_4
add_1_root_sub_0_root_add_33911.43387.3911.43380.00000.0000single_loop_DW01_add_5
add_341636.588413.21636.58840.00000.0000single_loop_DW01_add_1
add_351636.588413.21636.58840.00000.0000single_loop_DW01_add_0
-----------------------------------------------------------------------------------------------
Total7361.32185059.45510.0000

DC综合面积单位um^2
请设置zeroloadModel重新综合查看结果，并对比
035----018综合结果cell数量少了，但是面积翻了10倍，进入lib库查看对比单元，report_area设置详细选项查看单元面积都行，应该非常好debug

两个工艺库lib文件的面积单位是否一致呢?

问题就在这里，从哪里可以看到库的长度单位呢

蒙一下，或找后端问问，或者打开layout看一下。

cell LEF

那个test case太小，基本上说明不了什么问题