| # 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 :) | |