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# Move `_zero` to special nets

Tool: Detailed Routing

Subcategory: Routing issue

## Conversation

### Blebowski
Hi,

related to previous question, when I proceed to detailed routing, I get:

```

detailed_route -bottom_routing_layer ME2 -top_routing_layer ME5
```

```
[ERROR DRT-0305] Net zero_ of signal type GROUND is not routable by TritonRoute. Move to special nets.
[ERROR GUI-0070] DRT-0305
```



Before, I created my voltage domain and power-grid like so:

```
add_global_connection -net VDD -pin_pattern {^VDD$} -power

add_global_connection -net VSS -pin_pattern {^VSS$} -ground

set_voltage_domain -name VDD_1V2 -power VDD -ground VSS



define_pdn_grid -name "Core"





add_pdn_stripe -layer ME1 -followpins -width 0.2



add_pdn_ring -grid "Core" -layers {ME4 ME5} -widths 4.5 -spacings 1.0 -core_offsets {0 0} -add_connect



add_pdn_stripe -layer ME4 -width 1.5 -pitch 20 -offset 0 -extend_to_core_ring
add_pdn_stripe -layer ME5 -width 1.5 -pitch 20 -offset 0 -extend_to_core_ring



add_pdn_connect -layers {ME1 ME4}

add_pdn_connect -layers {ME1 ME5}



pdngen

```



I thought that "moving zero_ to special nets" can be accomplished by something like:
```

assign_ground_net -domain VDD_1V2 -net [get_nets zero_]

```
But that throws me:
```

[ERROR ODB-0335] group does not exist

[ERROR GUI-0070] ODB-0335

```

Can you help me out here?
Probably I am just doing something super-stupid...


### maliberty
Generally _zero is avoided by using hilomap in yosys.  If you are not using yosys then I suggest using insert_tiecells

### Blebowski
Thanks :)