| # Move `_zero` to special nets |
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| Tool: Detailed Routing |
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| Subcategory: Routing issue |
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| ## Conversation |
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| ### Blebowski |
| Hi,
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| related to previous question, when I proceed to detailed routing, I get:
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| ```
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| detailed_route -bottom_routing_layer ME2 -top_routing_layer ME5
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| ```
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| ```
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| [ERROR DRT-0305] Net zero_ of signal type GROUND is not routable by TritonRoute. Move to special nets.
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| [ERROR GUI-0070] DRT-0305
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| ```
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| Before, I created my voltage domain and power-grid like so:
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| ```
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| add_global_connection -net VDD -pin_pattern {^VDD$} -power
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| add_global_connection -net VSS -pin_pattern {^VSS$} -ground
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| set_voltage_domain -name VDD_1V2 -power VDD -ground VSS
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| define_pdn_grid -name "Core"
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| add_pdn_stripe -layer ME1 -followpins -width 0.2
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| add_pdn_ring -grid "Core" -layers {ME4 ME5} -widths 4.5 -spacings 1.0 -core_offsets {0 0} -add_connect
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| add_pdn_stripe -layer ME4 -width 1.5 -pitch 20 -offset 0 -extend_to_core_ring
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| add_pdn_stripe -layer ME5 -width 1.5 -pitch 20 -offset 0 -extend_to_core_ring
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| add_pdn_connect -layers {ME1 ME4}
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| add_pdn_connect -layers {ME1 ME5}
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| pdngen
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| ```
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| I thought that "moving zero_ to special nets" can be accomplished by something like:
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| ```
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| assign_ground_net -domain VDD_1V2 -net [get_nets zero_]
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| ```
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| But that throws me:
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| ```
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| [ERROR ODB-0335] group does not exist
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| [ERROR GUI-0070] ODB-0335
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| ```
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| Can you help me out here?
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| Probably I am just doing something super-stupid...
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| ### maliberty |
| Generally _zero is avoided by using hilomap in yosys. If you are not using yosys then I suggest using insert_tiecells |
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| ### Blebowski |
| Thanks :) |
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