Is Verilog code sequential?
This article focuses on using Verilog to describe synchronous sequential circuits. In a previous article, we discussed the description of combinational circuits using Verilog language elements. This article focuses on describing synchronous sequential circuits.
What is sequential block in Verilog?
The sequential block has the following characteristics, such as: Statements will be executed in the sequence, one after another. Delay values for each statement are treated relative to the simulation time of the previous statement’s execution. Control can pass out of the block after the last statement executes.
What is sequential and combinational logic?
In automata theory, sequential logic is a type of logic circuit whose output depends not only on the present value of its input signals but on the sequence of past inputs, the input history as well. This is in contrast to combinational logic, whose output is a function of only the present input.
What does output logic block in Verilog mean?
The “Output Logic” block is again a combinational circuit that processes the “Inputs” and “state_reg” to determine the system outputs. Separating a synchronous system to storage elements and some combinational circuits as shown in Figure 1 helps us to more easily find the HDL description of the system.
How is Verilog used to describe a sequential circuit?
This article focuses on using Verilog to describe synchronous sequential circuits. This article focuses on using Verilog to describe synchronous sequential circuits. In a previous article, we discussed the description of combinational circuits using Verilog language elements. This article focuses on describing synchronous sequential circuits.
When does the always block get activated in Verilog?
When the “always” block gets activated, the “reset” is checked. If it’s logic high, the DFF output is reset (q <= 1’b0). If “reset” is not logic high, then it’s the “clk” signal that has experienced a rising edge and the DFF output should get the value of input (q <= d).
How does a load counter work in Verilog?
When the “load” input is asserted, the input data (d) is loaded into the counter (q=d). When both “load” and “en” are logic low, the counter keeps its current value. For “load”=0 and “en”=1, the counter may count either upward or downward depending on the value of the “up_downb” input.