VERILOG : 7. User Defined Primitives (UDPs)
🔹 What are User Defined Primitives (UDPs)? In Verilog, User Defined Primitives (UDPs) are a way to create custom logic primitives beyond the limited set of built-in primitives. They allow designers to define combinational logic or sequential logic using truth tables. 👉 In simple words, UDPs are custom truth tables written in Verilog. For example: Combinational UDP → Works like a simple gate (AND, OR, XOR, etc.) but defined by the user. Sequential UDP → Models latches, flip-flops, and other memory elements. These are particularly useful when modeling ASIC libraries or verifying custom-designed hardware components. 🔹 Syntax of a UDP Every UDP in Verilog follows a strict syntax: primitive udp_name (output, input1, input2, ...); output <output_port>; input <input_port(s)>; reg <output_port>; // Only required for sequential UDP // Optional initialization initial <output_port> = <init_value>; table <input_co...