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…
What are Placement and Routing Blockages in VLSI? There are basically two types of blockages in VLSI,.i.e., Placement Blockages and Routing Blockages. The Placement Blockages are again classified into three types. They are hard blockages, soft blockages and partial blockages.…
What are Floorplan Module Constraints in VLSI? There are basically five different type of module constraint. They are as follows: None A module has the attribute None, if it is not preplaced in the core design area. A module can…
Macro Placement Guidelines After Pin placement, we place macros in the design keeping in mind below rules: One thing I am sure that if you read the below points carefully, you will be able to easily place macros for any…
What are Macros? Macro Cells are the Memory cells. These IPs have been designed by some other Analog design team, which can be used in the floor plan stage of the design. Type of Macros There are following three types…
What is Floorplan? Before hitting this particular topic of Floorplan, let’s take an example of building a house. If we are going to build a house, we first specify the area for different rooms, such as balcony, kitchen, lawn, etc.…
Standard design constraints or Synopsys design constraints contains the timing and power related constraints which control design w.r.t to the spec. SDC contents: #Clock definition: To define clock, we need following four mandatory informations. 1. Clock source: it can be…