PramitKumar Pal
07/03/2023, 3:31 AMSubcircuit summary:
Circuit 1: x6_bit_dac |Circuit 2: 6_bit_dac
-------------------------------------------|-------------------------------------------
sky130_fd_pr__nfet_g5v0d10v5 (120) |sky130_fd_pr__nfet_g5v0d10v5 (120)
sky130_fd_pr__pfet_g5v0d10v5 (120) |sky130_fd_pr__pfet_g5v0d10v5 (120)
switch2n_3v3 (16) |switch2n_3v3 (16)
Number of devices: 256 |Number of devices: 256
Number of nets: 163 **Mismatch** |Number of nets: 162 **Mismatch**
---------------------------------------------------------------------------------------
NET mismatches: Class fragments follow (with fanout counts):
Circuit 1: x6_bit_dac |Circuit 2: 6_bit_dac
How do I find where is the extra net coming from in the layout ? I double checked the 6_bit_dac layout and upto 5bit_dac everything was lvs clean. I have attached the comp.out file, and both the netlist for layout and schematic along with the screenshot for the schematic. Thank you.Mitch Bailey
07/03/2023, 10:40 AMVCC
is connected to all the cells
(no matching net) |Net: VCC
| sky130_fd_pr__pfet_g5v0d10v5/(1|3) = 60
| sky130_fd_pr__pfet_g5v0d10v5/4 = 120
| switch2n_3v3/VCC = 16
---------------------------------------------------------------------------------------
while in the layout it is split into 2 nets that are not connected at the top level.
Net: x5_bit_dac:5_bit_dac_0[1]/VCC |(no matching net)
sky130_fd_pr__pfet_g5v0d10v5/(1|3) = 30 |
sky130_fd_pr__pfet_g5v0d10v5/4 = 60 |
switch2n_3v3/VCC = 8 |
|
Net: x5_bit_dac:5_bit_dac_0[0]/VCC |(no matching net)
sky130_fd_pr__pfet_g5v0d10v5/(1|3) = 30 |
sky130_fd_pr__pfet_g5v0d10v5/4 = 60 |
switch2n_3v3/VCC = 8 |
Check the layout top level VCC
connections.PramitKumar Pal
07/03/2023, 10:46 AMLinen is a search-engine friendly community platform. We offer integrations with existing Slack/Discord communities and make those conversations Google-searchable.
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