*****************************************************************************************
INCORRECT INSTANCES
DISC# LAYOUT NAME SOURCE NAME
*****************************************************************************************
7 ** missing instance ** MPD2/M1 MP(pmos4)
** no similar net ** g: PDN
** VD33(53.750,42.450) ** s: VD33
** 5(212.650,56.500) ** d: COMPN
** VD33(53.750,42.450) ** b: VD33
Example16中,netlist中出现在block ‘MPD2’中的pmos4-M1在layout中找不到。找不到的原因大概是:layout中没有画;被忽略掉;layout画得有问题,没有被lvs认出;layout中连线错误,这个device与其它device合并了。
8. PROPERTY ERRORS部分: 主要描述layout和netlist中对应的device的参数错误,例如length、width、area等。
Example17(参见:lvs_test8.rep):
*****************************************************************************************
PROPERTY ERRORS
DISC# LAYOUT SOURCE ERROR
*****************************************************************************************
8 36(212.050,56.500) MP(pmos4) MPD1/M1 MP(pmos4) w: 8 u w: 4 u 100%
Example17中,对应的这个pmos4在layout中的width是8um,而在netlist中是4um。
9. LVS PARAMETERS部分: 这部分描述的是lvs command file中定义的各种参数设置,可以忽略; Example18:
**********************************************************************************
LVS PARAMETERS
**********************************************************************************
o LVS Setup:
LVS COMPONENT TYPE PROPERTY LVS_TYPE LVS COMPONENT SUBTYPE PROPERTY LVS_SUBTYPE LVS PIN NAME PROPERTY PHY_PIN PIN
LVS POWER NAME \VDD5O\
LVS GROUND NAME \SSA\
LVS RECOGNIZE GATES NONE LVS IGNORE PORTS NO LVS CHECK PORT NAMES NO LVS BUILTIN DEVICE PIN SWAP YES LVS ALL CAPACITOR PINS SWAPPABLE NO LVS DISCARD PINS BY DEVICE NO ...
... ...
10. INFORMATION AND WARNINGS部分:layout和netlist中匹配情况的统计,以及各种不匹配的信息;
Example19(参见:lvs_test8.rep):
*******************************************************************************
INFORMATION AND WARNINGS
*******************************************************************************
Matched Matched Unmatched Unmatched Component
Layout Source Layout Source Type
------- ------- --------- --------- ---------
Ports: 8 8 0 1
Nets: 19 19 1 3
Instances: 14 14 1 1 MN(nmos4)
6 6 0 0 MN(nmosi)
13 13 0 1 MP(pmos4)
------- ------- --------- --------- Total Inst: 33 33 1 2
o Statistics:
65 isolated layout nets were deleted.
19 layout mos transistors were reduced to 5.
14 mos transistors were deleted by parallel reduction. 14 source mos transistors were reduced to 3.
11 mos transistors were deleted by parallel reduction.
Example19中,前面的列表是对整个layout和netlist中匹配情况的一个统计;后面的描述表示有多少device被合并或者剔除。
Example20(参见:lvs_test7.rep):
o Isolated Layout Nets:
(Layout nets which are not connected to any instances or ports).
18(169.800,39.400) 19(169.800,151.900) 23(15.400,42.050) 24(15.400,120.850) 25(31.400,38.450) 26(31.400,114.250) 27(45.000,72.050) 28(45.000,120.850) 29(51.150,36.750) 30(51.150,163.900) 31(51.450,58.050) 32(51.450,150.850) 33(69.400,54.150) 34(69.400,111.850) 35(106.200,43.050) 36(106.200,120.850) 37(117.300,38.450) 38(117.300,114.250) 39(144.300,42.050) 40(144.300,120.850) 41(155.400,38.450) 42(155.400,114.250) 43(169.800,39.400) 44(169.800,151.900) 45(171.200,84.350) 46(171.200,118.550) 47(176.600,49.200) 48(176.600,161.700) 49(183.550,46.200) 50(183.550,161.700) 51(183.600,73.600) 52(183.600,119.250) 53(210.550,46.900) 54(210.550,61.700) 55(218.950,46.900)
56(223.750,46.900) 57(0.400,27.050) 58(12.800,39.450) 59(12.800,115.250) 60(42.400,69.450) 61(42.400,115.250) 62(48.650,52.350) 63(48.650,148.250) 64(53.750,42.450) 65(53.750,166.500) 66(72.000,56.750) 67(72.000,116.150) 68(91.200,27.050) 69(103.600,39.450) 70(103.600,115.250)
Example20中,列出在layout找到的孤立的net,这些net没有连接到任何的device上,是一些悬空的net,可能是由于floating的dummy metal引起,可以忽略。
Example21(参见:lvs_test7.rep):
o Passthrough Layout Nets And Their Ports:
(Layout nets which are connected only to ports).
zener_array[1](943.800,997.400) (port: zener_array[1]), zener_array[0](943.800,1055.000) (port: zener_array[0]),
Example21中,表示layout中有两个net没有连接到任何device,只接到了两个port上 标签: lvs
LVS实例
熟悉netlist 文件 例:
*******MUX2 NETLIST ********
*.BIPOLAR
*.RESI=1K
.INCLUDE ./inv.cir .PARAM
.GLOBAL VSS:G VDD:P
***************************
.SUBCKT MUX2 OUT SIGN OP1 OP2 WP=1u WL=1u
+LP=0.5u LN=0.5u
MI01 OP2 NET01 VDD VDD P W=WP L=LP
MI02 OP2 SIGN VDD VSS N W=WN L=LN