11/3/2023 0 Comments Sequential logic circuit counterThe goal of this chapter is to provide an understanding of the basic operation of sequential logic circuits. Finally, we look at one of the most important logic circuits in digital systems, the finite state machine. We then look at some useful circuits that can be created using only sequential logic storage devices. This is followed by an investigation of timing considerations of sequential logic circuits. If we are in an operating mode where saving a few gates matters (which is unlikely) we can describe a more economical counter circuit as shown in. We begin by looking at sequential logic storage devices, which are used to hold the past values of a system. The set and reset inputs on the flip flops could remain unused (tied low) or they could be used to force the circuit to power up in the correct state. The ability of a sequential logic circuit to base its outputs on both the current and past inputs allows more sophisticated and intelligent systems to be created. In a combinational circuit, the output depends only on the present value of the inputs. We’ll first look at a general model for synchronous circuits and then discuss the Verilog description of a bidirectional counter as an example. This is different from the combinational logic design where the output of the circuitry depends only on the current values of the inputs. This article focuses on describing synchronous sequential circuits. Sequential logic design differs from combinational logic design in that the outputs of the circuit depend not only on the current values of the inputs but also on the past values of the inputs. In this chapter we begin looking at sequential logic design. The logic circuits discussed previously are known as combinational, in that the output depends only on the condition of the latest inputs However, we will now introduce a type of logic where the output depends not only on the latest inputs, but also on the condition of earlier inputs.
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