Jerry Yau
Member level 4
Hi sir,
I have a resistor which 2 terminals are shorted together shown in follow picture :
resistor
|----------------------------^^^^^^^^^--------------------|
---|---------------------------------------------------- -----|
terminal 1 A wire to short resistor terminal 2
Ans I implement it in layout as following:
metal1 nwell metal1 nwell metal1
l------------=========--------------==========----------l
l wire1 resistor 1 wire2 resistor 2 wire3 l
---l-------------------------------------------------------l
terminal 1 metal1 terminal 2
My calibre lvs rule file has following settting :
LVS FILTER UNUSED OPTION B C D E F G H I J K O RC LAYOUT
LVS FILTER UNUSED OPTION F G H I J K O SOURCE
LVS REDUCE SERIES RESISTORS YES
LVS REDUCE PARALLEL RESISTORS YES
So I want calibre can combine two nwell resistors to one resistor which 2 terminals are shorted by metal1 in order to match the schematic.
After runing lvs process, calibre said this 2 resistors are parallel not series and then report there is a missing net named wire2 in schematic.
How can I resolve this problem if we can't modify layout?
Thanks.
I have a resistor which 2 terminals are shorted together shown in follow picture :
resistor
|----------------------------^^^^^^^^^--------------------|
---|---------------------------------------------------- -----|
terminal 1 A wire to short resistor terminal 2
Ans I implement it in layout as following:
metal1 nwell metal1 nwell metal1
l------------=========--------------==========----------l
l wire1 resistor 1 wire2 resistor 2 wire3 l
---l-------------------------------------------------------l
terminal 1 metal1 terminal 2
My calibre lvs rule file has following settting :
LVS FILTER UNUSED OPTION B C D E F G H I J K O RC LAYOUT
LVS FILTER UNUSED OPTION F G H I J K O SOURCE
LVS REDUCE SERIES RESISTORS YES
LVS REDUCE PARALLEL RESISTORS YES
So I want calibre can combine two nwell resistors to one resistor which 2 terminals are shorted by metal1 in order to match the schematic.
After runing lvs process, calibre said this 2 resistors are parallel not series and then report there is a missing net named wire2 in schematic.
How can I resolve this problem if we can't modify layout?
Thanks.