If macros are placed in the core area, what issues might be observed?

o   Routing Congestion: Macros create "pinch points" or areas of high congestion around the corners and between adjacent macros, making it difficult for the router to connect signals. And creates Routing Detours resulting in longer wire lengths, increased delay, and potentially new timing violations.

o   Sub-optimal Standard Cell Placement: tool not able to optimize placement.

o   Power Distribution Issues: If a macro is particularly power-hungry, placing it in the middle of the core can cause a significant local IR drop unless the power grid is specifically reinforced in that area.

o   Clock Tree Synthesis (CTS) Challenges: Macros can obstruct clock tree routing, making it harder for CTS tools to build a balanced tree with low skew.