228.4) on layer 39 "metal3"
The name "osc32k" was assigned to the net.
.........
o Example4_1 (参见文件“lvs_test4_1.rep”) :如果在P substrate上出现没有通过金属直接连接的P substrate tie,那么这些P substrate tie会引起soft connect的warning,这个例子中net “chg_out_p”连接到了某个P substrate tie,与gnd!通过P substrate短路到了一起,net “chg_out_p”被忽略掉。解决办法是找到net “chg_out_p”与P substrate短路的地方;
Example4_1:
.........
WARNING: Stamping conflict in SCONNECT - Multiple source nets stamp one target net.
Net gnd! is selected for stamping.
Rejected nets: chg_out_p
.........
o Example4_2 (参见文件“lvs_test4_2.rep”) :这个例子和上一个例子基本一样,不同的是和gnd! sconnect的这个net在layout上没有标记label。 ”2089”是calibre从layout中提取并随机命名的net。解决办法是在report的具体信息中找到net 2089的坐标,再在layout中查找该点的net是如何通过P substrate短路到gnd!;
Example4_2:
.........
WARNING: Stamping conflict in SCONNECT - Multiple source nets stamp one target net.
Net gnd! is selected for stamping.
Rejected nets: 2089
...
...
...
1 Net gnd!(33.050,176.900) GND!
2089(33.050,47.300)
...
...
2.Lvs中Input和Output的信息:
该部分主要记录calibre中的一些信息,例如layout,netlist,report file,运行时间以及calibre的版本信息。
Example5:
REPORT FILE NAME: lvs.rep
LAYOUT NAME: ../gds/lan_yang_dig_lvs_test3.gds
SOURCE NAME: LANYANG_FULLCHIP_V11_20060427.CIR ('Lan_Yang_Dig')
RULE FILE: xc06_calibre_lvs_302.rul
RULE FILE TITLE: XC06 Calibre DRC/LVS File
LVS MODE: Mask
RULE FILE NAME: xc06_calibre_lvs_302.rul
CREATION TIME: Thu May 18 15:44:02 2006
CURRENT DIRECTORY: /direct/cd-home/gene.huang/tuna/lvs
USER NAME: gene.huang
CALIBRE VERSION: v2005.2_6.10 Wed Ju
l 13 17:47:45 PDT 2005
3. Lvs是否匹配最明显的标志:NOT COMPARED, CORRECT 和 INCORRECT
? NOT COMPARED(参见lvs_test1.rep): lvs没有完成,会有Error信息出现在report file的开头,提示为什么lvs没有进行,一般是lvs文件中input的信息不对;
Example6:
# # ########################
# # # #
# # NOT COMPARED #
# # # #
# # ########################
? CORRECT:layout与netlist匹配;
Example7:
# ################### _ _
# # # * *
# # # CORRECT # |
# # # # \___/
# ###################
? INCORRECT(参见lvs_test5.rep): layout与netlist不匹配,有error信息提示,表示具体不匹配的原因;
Example8:
# # #####################
# # # #
# # INCORRECT #
# # # #
# # #####################
Error: Different numbers of nets (see below).
Error: Connectivity errors.
4.OBJECTS信息:
? INITIAL NUMBERS OF OBJECTS: 表示转换前layout和netlist中的net数目,器件类型和器件数目。这部分不用太留意,因为最终的器件数目会在转换后有所变化。根据lvs command file中的某些设置,某些器件可以合并,或被剔除:
Example9(参见:lvs_test5.rep):
INITIAL NUMBERS OF OBJECTS
--------------------------
Layout Source Component Type
------ ------ --------------
Ports: 95 95
Nets: 21732 9901 *
Instances: 9529 9489 * MN (4 pins)
9543 9489 * MP (4 pins)
6 6 R (3 pins)
6 6 D (2 pins)
------ ------
Total Inst: 19084 18990
? NUMBERS OF OBJECTS AFTER TRANSFORMATION: 表示转换后layout和netlist中的net数目,器件类型和数目。某些器件被合并或者剔除,从例子中可以看到,netlist(Source