热度 20| |
Report中,该部分分为左右两列,左边部分表示layout中关于某个net的信息,右边表示netlist中该net的信息。
· Open(断路):layout中出现两个net的信息,而netlist中只出现一个net的信息。这是典型的断路错误。解决办法:根据net的坐标到layout中找到两个net断开的地方。
Example11(参见:lvs_test5.rep):
***********************************************************
INCORRECT NETS
DISC# LAYOUT NAME SOURCE NAME
***********************************************************
1 Net vdd!(32.800,839.700) VDD!
2089(62.400,35.250)
-------------------- -----------------
--- Devices on layout net 2089(62.400,35.250) ---
19074(307.950,38.300) R(RDIFFP3) u_clock_divider/u37/RR0 R(RDIFFP3)
pos: 567(306.950,38.300) neg: u_clock_divider/N2
neg: 2089(62.400,35.250) pos: VDD!
sub: 2089(62.400,35.250) sub: VDD!
…
…
Example11中,layout的vdd!与net 2089是两个不同的net,但是在netlist中这两点都对应VDD!;后面的具体信息是这两个net上对应的device的信息,在layout中这个电阻的neg和sub两端接到了net 2089,但是在netlist中应该是接到VDD!;
Example12(参见:lvs_test6.rep):
*******************************************************************
INCORRECT NETS
DISC# LAYOUT NAME SOURCE NAME
*******************************************************************
1 Net 54(43.600,1162.700) u_clock_divider/CLK16_FROM32K
1543(50.700,1206.450)
------------------------ --------------------------
Example12中,同样是一个open的错误类型,layout中的net 54和net 1543都对应netlist中的同一个net;
· Layout与netlist不对应的net:layout中某些net在netlist中找不到对应的net。解决办法:根据含有该net的device的坐标找到对应的layout,对照schematic查找错误的地方;
Example13(参见:lvs_test7.rep):
1 Net 510(876.200,1138.300) ** no similar net **
--- Devices on layout net 510(876.200,1138.300) ---
19070(908.200,1199.300) MP(pmos4) osc32k__L1_I0/in_2/MMMP1/M1 MP(pmos4)
G: 5735(904.500,1202.300) g: osc32k__L1_I0/NETZ9
S: vdd!(32.800,839.700) s: VDD!
B: vdd!(32.800,839.700) b: VDD!
D: 510(876.200,1138.300) ** no similar net **
** no similar net ** d: osc32k__L1_N0
Example13中,layout中的net 510在netlist中找不到对应的net;在layout中的一个pmos4的Drain端为net 510,对应的netlist中的该pmos4的Drain端为osc32k__L1_N0,判断layout中该net连接有错误,到layout中查找该pmos4的Drain的坐标510 (876.200,1138.300)再对照schematic找连接错误的地方;
Example14(参见:lvs_test7.rep):
2 ** no similar net ** u_lan_yang_dig_core/U_ADC_CONTROL_ADC_COUNTER_11_
--- Devices on source net u_lan_yang_dig_core/U_ADC_CONTROL_ADC_COUNTER_11_ --
18798(887.100,1203.300) MP(pmos4) u_lan_yang_.../r384_u1_1_11/in_3/MMMP1/M1 MP(pmos4)
S: vdd!(32.800,839.700) s: VDD!
D: 5639(887.700,1203.300) d: u_lan_yang_dig_core/r384_u1_1_11/NETZ43
B : vdd!(32.800,839.700) b: VDD!
G: 510(876.200,1138.300) ** no similar net **
** no similar net ** g: u_lan_yang_dig_core/U_ADC_CONTROL_ADC_COUNTER_11_
Example14中,netlist中的u_lan_yang_dig_core/U_ADC_CONTROL_ADC_COUNTER_11_在layout中找不到对应的net,但是netlist中与该net有关联的device在layout中有对应,从中找到layout中该device的坐标,查找其Gate端的连线是否正确;
6. INCORRECT PORTS 部分:这部分描述layout中和netlist中不对应的input和output的PORT名称。
Example15(参见:lvs_test8.rep):
*****************************************************************************************
INCORRECT PORTS
DISC# LAYOUT NAME SOURCE NAME
*****************************************************************************************
6 ** missing port ** COMP on net: COMP
Example15中,netlist中出现了COMP这个端口,但是在layout中没有标示出来。
7. INCORRECT INSTANCES 部分:描述layout中和netlist中不对应的device。
Example16(参见:lvs_test8.rep):
*****************************************************************************************
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 "VDD" "VDDA" "VDD3" "VDD5O" "VDD5R" "VDD3O" "VDD3R" "VDD!" "vdd!" "RAMVDD"
LVS GROUND NAME "GND" "GNDA" "VSS" "VSSA" "GND!" "gnd!" "RAMGND"
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