| <p>Metal configurable gate array cells are specially developed for Metal Only ECO. These cells come in two types, which are used in different backend stages. The first type is gate array spare cells, which are typical filler or decap cells used in the original flow. During the backend P&R stage, gate array spare cells such as GFILL/GDCAP are incorporated and distributed throughout the design. The second type is gate array functional cells, which are used in post-mask ECO. Gate array spare cells are replaced with gate array functional cells such as GAN2, GND2, and GXOR2.</p> | |