Limited release of the SKY130 IO and periphery cells.
Release of a subset of the full IO. This release includes;
* Power pads;
- High voltage - `top_power_hvc_wpad`, `top_ground_hvc_wpad`
- Low voltage - `top_power_lvc_wpad`, `top_ground_lvc_wpad`
* Reference generators - `top_refgen`, `top_refgen_new`.
* Standard GPIO (`top_gpiov2`).
* I2C compatible GPIO with over-voltage tolerance (`top_gpio_ovtv2`).
* Special SIO (`top_sio`) with differential macro (`top_sio_macro`).
* System wide reset influencing XRES cell (`top_xres4v2`).
Future release will include;
* Original standard GPIO (`top_gpio`).
* More power pad versions.
* More XRES cells.
* More reference generators (`top_vrefcapv2`, etc).
* Spice and CDL models for the IOs.
Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>
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