when floorplanning, which metals should be use for core rings and power strapes? top two layer or bottom two layer?
or others ? and what are the advantages and disadvantages of the these stratagems?
But I think we should use different levels met in vertical and horizontal direction, it will be convenient for later routing.
I think so, but if there is something wrong, pls correct it. Thank you!
I always use the top 2 layers for core ring and power straps. but in some design, i found that the top layer was always preserved, why? what is the advantages?
top layer have min cap which relax the power supply swing's effect for function cell!!! i often use different layer for the horizonal and vertical rings!!!