| Pad Instance Clamp connections |
| DRN1 SRC1 DRN2 SRC2 B2B |
| ---------------------------------------------------------------------------------------- |
| sky130_ef_io__vddio_hvc_pad \mgmt_vddio_hvclamp_pad[0] vddio, vssio |
| sky130_ef_io__vddio_hvc_pad \mgmt_vddio_hvclamp_pad[1] vddio, vssio |
| sky130_ef_io__vssio_hvc_pad \mgmt_vssio_hvclamp_pad[0] vddio, vssio |
| sky130_ef_io__vssio_hvc_pad \mgmt_vssio_hvclamp_pad[1] vddio, vssio |
| ----------------------------------------------------------------------------------------- |
| sky130_ef_io__vdda_hvc_pad mgmt_vdda_hvclamp_pad vdda, vssa |
| sky130_ef_io__vssa_hvc_pad mgmt_vssa_hvclamp_pad vdda, vssa |
| sky130_ef_io__vdda_hvc_pad user1_vdda_hvclamp_pad vdda1, vssa1 |
| sky130_ef_io__vssa_hvc_pad user1_vssa_hvclamp_pad vdda1, vssa1 |
| sky130_ef_io__vdda_hvc_pad user2_vdda_hvclamp_pad vdda2, vssa2 |
| sky130_ef_io__vssa_hvc_pad user2_vssa_hvclamp_pad vdda2, vssa2 |
| ----------------------------------------------------------------------------------------- |
| sky130_ef_io__vccd_lvc_pad mgmt_vccd_lvclamp_pad vccd, vssio, vccd, vssd, vssa |
| sky130_ef_io__vssd_lvc_pad mgmt_vssd_lvclmap_pad vccd, vssio, vccd, vssd, vssa |
| ----------------------------------------------------------------------------------------- |
| sky130_ef_io__vccd_lvc_pad user1_vccd_lvclamp_pad vccd1, vssd1, vccd1, vssd, vssio |
| sky130_ef_io__vssd_lvc_pad user1_vssd_lvclmap_pad vccd1, vssd1, vccd1, vssd, vssio |
| sky130_ef_io__vccd_lvc_pad user2_vccd_lvclamp_pad vccd2, vssd2, vccd2, vssd, vssio |
| sky130_ef_io__vssd_lvc_pad user2_vssd_lvclmap_pad vccd2, vssd2, vccd2, vssd, vssio |
| ----------------------------------------------------------------------------------------- |
| |
| Overlay types used: |
| 1. hvc_pad: vddio -> vssio |
| 2. hvc_pad vdda -> vssa |
| 3. lvc_pad vccd -> vssio, vccd -> vssd vssa |
| 4. lvc_pad vccd -> vssd, vccd -> vssdG vssio |
| |
| NOTE: Type (4) crosses domains, so that the local VCCD has a diode to the |
| local VSSD and also to the global VSSD. BUT: Although vccd goes all the way |
| around the chip in the form of vcchib, vssd does not, which makes the SRC2 |
| connection effectively unreachable in this configuration, so better to just |
| change it to vssd1 and vssd2 for the respective domains. |
| |
