![]() Ncsim: *W,RNQUIE: Simulation is complete. Else as long as enable is high, output q follows input d If reset is asserted then output will be zero So, you make sure that your clock speed is slow enough that the circuits all have time to react and stabilize before the next transition. This always block is "always" triggered whenever en/rstn/d changes Output reg q) // 1-bit output pin for data output Input rstn, // 1-bit input pin for active-low reset Input en, // 1-bit input pin for enabling the latch Module d_latch ( input d, // 1-bit input pin for data The value of output q is dictated by the inputs d, en and rstn. Reset being active-low simply means that the design element will be reset when this input goes to 0 or in other words, reset is active when its value is low. The input d stands for data which can be either 0 or 1, rstn stands for active-low reset and en stands for enable which is used to make the input data latch to the output. ![]() In this example, we'll build a latch that has three inputs and one output. When the clock is high, D flows through to Q and is transparent, but when the clock is low the latch holds its output Q even if D changes.Ī flip-flop on the other hand captures data at its input at the positive or negative edge of a clock and output does not reflect changes in the input until the next clock edge. ![]() Introduction What is Verilog? Introduction to Verilog Chip Design Flow Chip Abstraction Layers Data Types Verilog Syntax Verilog Data types Verilog Scalar/Vector Verilog Arrays Building Blocks Verilog Module Verilog Port Verilog Module Instantiations Verilog assign statements Verilog assign examples Verilog Operators Verilog Concatenation Verilog always block Combo Logic with always Sequential Logic with always Verilog initial block Verilog in a nutshell Verilog generate Behavioral modeling Verilog Block Statements Verilog Assignment Types Verilog Blocking/Non-blocking Verilog Control Flow Verilog Conditional Statements Verilog for Loop Verilog case Statement Verilog Functions Verilog Tasks Verilog Parameters Verilog `ifdef `elsif Verilog Delay Control Verilog Inter/Intra Delay Verilog Hierarchical Reference Gate/Switch modeling Gate Level Modeling Gate Level Examples Gate Delays Switch Level Modeling User-Defined Primitives Simulation Verilog Simulation Basics Verilog Timescale Verilog Scheduling Regions Verilog Clock Generator System Tasks and Functions Verilog Display tasks Verilog Math Functions Verilog Timeformat Verilog Timescale Scope Verilog File Operations Code Examples Hello World! Flops and Latches JK Flip-Flop D Flip-Flop T Flip-Flop D Latch Counters 4-bit counter Ripple Counter Straight Ring Counter Johnson Counter Mod-N Counter Gray Counter Misc n-bit Shift Register Binary to Gray Converter Priority Encoder 4x1 multiplexer Full adder Single Port RAM Verilog Pattern Detector Verilog Sequence DetectorĪ latch has two inputs : data(D), clock(clk) and one output: data(Q). ![]()
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