May 22, 2014

KR580VM80A - getting ready for reverse engineering : weekend die-shot

We decided to take a closer look at the most popular soviet processor KR580VM80A (first shoot), so that group of enthusiasts (russian only) would be able to recover schematic from it's layout.

A bit more dirt, but less overetch:

Dark field - metal is clearly visible:

Polarized light - metal and vias are visible:

After metallization etch. Any ideas why polysilicon gone?