![]() ![]() ![]() ![]() The language also supports the modeling of tri-state gates, including bufif0, bufif1, notif0, and notif1. The multiple-output gates are buf and not whose output is one or more and has only one input. The multiple-input gates are and, nand, or, nor, xor, and xnor whose number of inputs are two or more, and has only one output. The gates supported are multiple-input, multiple-output, tri-state, and pull gates. Verilog supports built-in primitive gates modeling. Verilog has gate primitives for all basic gates. Gate level modeling is used to implement the lowest-level modules in a design, such as multiplexers, full-adder, etc. Gate level modeling is virtually the lowest level of abstraction because the switch-level abstraction is rarely used. Verilog supports a few basic logic gates known as primitives, as they can be instantiated, such as modules, and they are already predefined. Modeling done at this level is called gate-level modeling as it involves gates and has a one to one relationship between a hardware schematic and the Verilog code. However, it becomes natural to build smaller deterministic circuits at a lower level by using combinational elements such as AND and OR. In Verilog, most of the digital designs are done at a higher level of abstraction like RTL. ![]()
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