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6. Sequential Logic - Flip-Flops Sequential circuits can be a asynchronous or synchronous. Asynchronous sequential circuits change their state and output values We form a sequential logic circuit via feedback - feeding state variables computed by a block of combinational logic back to its input. sequential circuits, ECE 301 - Digital Electronics Introduction to and Analysis of Sequential Logic Circuits (Lecture #21) The slides included herein were taken from the materials 1 Sequential Logic Circuits - Part I (Memory Element) CIT 595 S i 2010Spring 2010 Sequential Logic Circuits Output depends on stored information (current state) and EECC341 - Shaaban #1 Lec # 13 Winter 2001 1-29-2002 Sequential Logic Circuits • Unlike combinational logic circuits, the output of sequential Combinational and Sequential Circuits. Basically, sequential circuits have memory and combinational circuits do not. Here is a basic depiction of a sequential circuit. Digital Design, Kyung Hee Univ. 4 Synchronous Sequential Circuit • Signals affect the storage elements at only discrete instants of time • Synchronization (by a 1 1 Sequential Circuits CS 217 2 Combinational circuit • Directed acyclic graph (no loops) • Outputs, at any given time, dependent only on inputs at that 5.4 Sequential Digital Circuits • Sequential logic differs from combinational logic in that the output of the logic device is dependent not only on the present Hardware Design with VHDL Sequential Circuit Design I ECE 443 ECE UNM 1 (11/23/09) Sequential Circuit Design: Principle Outline: • Overview of sequential circuits 1 5-1 Chapter 5 Synchronous Sequential Logic 5-2 Outline ! Sequential Circuits! Latches! Flip-Flops! Analysis of Clocked Sequential Circuits! State Reduction and 1 5-1 Chapter 5 Synchronous Sequential Logic 5-2 Outline ! Sequential Circuits! Latches! Flip-Flops! Analysis of Clocked Sequential Circuits! State Reduction and The Sequential Circuits Pro-One Annotated Manual [Annotations in bold square brackets by jet.] [Scanned from a photocopy of the original. Original format retained Hardware Design with VHDL Sequential Circuit Design II ECE 443 ECE UNM 3 (9/25/12) Poor Sequential Circuit Design Practice-- register process(clk, async_clr) We have been discussing combinational circuits. The outputs of a combinational circuit are based solely on current inputs. The output of a sequential circuit, by