What are multi driven nets?

2) Multi-Driven nets: This RTL coding mistake is quite common, it occurs when the same net in RTL is driven by two or more drivers. The multi-driven nets are processed differently by different tools used in verification and synthesis; these might result in wrong RTL functionality and further wrong design closure.

What is Undriven input ports in VLSI?

Undriven Input Port The ports present in the design must have a connection whether it is signal/clock/power ports. If input port is unconnected, that means the input logic we are getting through that port will not be propagated in the design, hence we will miss the logic.

What are the steps in synthesis in VLSI?

Synthesis takes place in multiple steps:

1. Converting RTL into simple logic gates.
2. Mapping those gates to actual technology-dependent logic gates available in the technology libraries.
3. Optimizing the mapped netlist keeping the constraints set by the designer intact.

Is connected to multiply driven net where other driver is constant?

next_state and state both have default values of state_type’LEFT ( SA ). In the absence of an explicit default expression, an implicit default value is assumed for a signal of a scalar subtype or for each scalar subelement of a composite signal, each of which is itself a signal of a scalar subtype.

How do I fix pin density in VLSI?

How to fix Congestion?

1. Rerun the fast placement with Congestion driven option (Congestion driven placement)
2. Modify physical constraints such as adjust cell density in congested areas.
3. Use/Modify proper blockages.
4. Modify floorplaning such as moving macros, change core shape/size, Move pins to give enough room for routing.

What is synthesis and simulation?

Simulation is the execution of a model in the software environment. The test bench is used in ALDEC to simulate our design by specifying the inputs into the system. Synthesis is the process of translating a design description to another level of abstraction, i.e, from behaviour to structure.