Power Ground Grid Insertion The step of power-ground grid insertion is also known as stripegen. There are mainly four things we do during the stripegen step: Add Ring Add Stripe Create special route Add VIAs PG ring and stripes…
Power Switch Cell Placement Power switch cells are physical only cells. Basically power switches are defined in UPF w.r.t power domains present in the design. We need power switch in the design to control the power depending upon the power…
Tap Cell Placement: Well Tap cells are physical only cells which are placed in the design to avoid latch-up condition and maintain VDD and VSS NWELL continuity. Latch-up condition: Latch-up basically means a short circuit condition between power and ground.…
What is Boundary Cap (End Cap) ? Boundary cap cells are physical only cells. These cells are placed at the periphery of the core and power domain. Boundary cap cells are placed just after macro placement in the floorplan flow.…
Level Shifter Cell: In most of the Low Power Designs, there are one or more power domains where we have more power domains which operates at different voltage level in a single partition. In this case, we need different…
Retention Flops: These cells are special flops with multiple power supply. They are typically used as a shadow register to retain their value even if the block in which they are residing is shut down. All the paths leading…
Isolation cell placement Power domains in the design has been designed in such a way that whenever it is required it gets switched on otherwise it is switched off. To control this behavior, we need isolation cells. Isolation cells…
What are TIE Cells? In the design we see that some signals are assigned to 1’b0 or 1’b1 to complete the logic requirement (assign a = 1 or 0). To make connections during physical implementation, we need to tie…
AON Cell In low power design, when we have always on power domain and switchable domain (ON/OFF Power Domain) and the cells are interacting between these domains then we need AON Cells which remains ON during OFF state of switchable…
Decap Cells Decap cell is basically a capacitor cell which is used temporarily in the design between power and ground rails to counter the functional failure. We cant have functional failure in our design. So to avoid any kind of…