COMPENG 2DI4 Lecture 13: Lecture Week 05--1.pdf
12 Feb 2015
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Document Summary
Sequential logic: all common digital devices have the ability to store, retrieve, and process binary information, we have completed the combinational logic, but to truly have a full digital system we will require memory elements. Memory elements: a synchronous system is clocked, memory is achieved by using digital devices called flip-flops. Flip-flop: sr latch (nor: there are several types, each with different function tables, must now consider a device"s or system"s current. State to determine its next state: example - the sr latch with nor gates. Flip-flop: sr latch (nand: example - the sr latch with nand gates. Sr-latch with control: now add an enable input. Flip-flop: d latch: have you seen this before, same as sr-latch with enable, but r = s", very useful as a memory element. Logic symbols: as with the combinational elements, we have graphic symbols to represent each type of ip- op (ff)
