open-source-silicon.dev

<https://github.com/RTimothyEdwards/open_pdks/issues/270|#270 [Minor issue] CLASS CORE SPACER missing for some spacers (Filler, decap, etc)>
New issue created by <https://github.com/armleo|armleo>
In some lefs the CLASS is wrong. They need to be core spacer. Otherwise they are used in density calculations by OpenROAD.

Locations:

<https://github.com/RTimothyEdwards/open_pdks/blob/6003ab31478184bceedc76eb650d8812e0cd6f5b/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__decap_12.lef#L6|open_pdks/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__decap_12.lef>

Line 6 in &lt;/RTimothyEdwards/open_pdks/commit/6003ab31478184bceedc76eb650d8812e0cd6f5b|6003ab3&gt;

<https://github.com/RTimothyEdwards/open_pdks/blob/6003ab31478184bceedc76eb650d8812e0cd6f5b/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__fill_12.lef#L6|open_pdks/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__fill_12.lef>

Line 6 in &lt;/RTimothyEdwards/open_pdks/commit/6003ab31478184bceedc76eb650d8812e0cd6f5b|6003ab3&gt;

And in the sky130_fd_sc_hd_decap_* cells.,

Needs to be:

```
CLASS CORE SPACER ;
```

<https://user-images.githubusercontent.com/7474152/184528332-017b9d2e-abf1-45f2-aa08-7ded9f3c3ffb.png|image>
<https://github.com/RTimothyEdwards/open_pdks|RTimothyEdwards/open_pdks>