新手请教：为什么用.18工艺综合出来的面积比.35还大？？

禅师1988 · 发表于 2012-9-8 18:34:20

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本帖最后由禅师1988 于 2012-9-8 18:38 编辑

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 area       Local cell area
                              ------------------  ---------------------------
Hierarchical cell                Absolute Percent  Combi- Noncombi-  Black
                              Total    Total national  national boxes Design
--------------------------------  ---------  -------  --------  ---------  ------  ----------------------
single_loop                      1157.5605 100.0  173.2502 450.6600  0.0000  single_loop
add_0_root_add_0_root_add_37_2    75.1300    6.5 75.1300    0.0000  0.0000  single_loop_DW01_add_3
add_1_root_add_0_root_add_37_2    115.3300    10.0  115.3300    0.0000  0.0000  single_loop_DW01_add_4
add_1_root_sub_0_root_add_33    104.5301    9.0  104.5301    0.0000  0.0000  single_loop_DW01_add_5
add_34                            119.3300    10.3  119.3300    0.0000  0.0000  single_loop_DW01_add_1
add_35                            119.3300    10.3  119.3300    0.0000  0.0000  single_loop_DW01_add_0
--------------------------------  ---------  -------  --------  ---------  ------  ----------------------
Total                                              706.9003 450.6600  0.0000

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 area          Local cell area
                              -------------------  ----------------------------
Hierarchical cell                Absolute Percent  Combi-    Noncombi-  Black
                              Total    Total national national boxes Design
--------------------------------  ----------  -------  ---------  ---------  ------  ----------------------
single_loop                      12420.7852 100.0 791.6831  5059.4551  0.0000  single_loop
add_0_root_add_0_root_add_37_2    804.9888    6.5 804.9888    0.0000  0.0000  single_loop_DW01_add_3
add_1_root_add_0_root_add_37_2    1580.0396    12.7  1580.0396    0.0000  0.0000  single_loop_DW01_add_4
add_1_root_sub_0_root_add_33       911.4338    7.3 911.4338    0.0000  0.0000  single_loop_DW01_add_5
add_34                            1636.5884    13.2  1636.5884    0.0000  0.0000  single_loop_DW01_add_1
add_35                            1636.5884    13.2  1636.5884    0.0000  0.0000  single_loop_DW01_add_0
--------------------------------  ----------  -------  ---------  ---------  ------  ----------------------
Total                                                 7361.3218  5059.4551  0.0000