Class Notes (808,753)
CSC258H1 (46)
Lecture

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School
University of Toronto St. George
Department
Computer Science
Course
CSC258H1
Professor
Steve Engels
Semester
Winter

Description
SEQUENTIAL CIRUCITS  Latches  Something to consider o If multiple gates of these types are combined, you can get more o Computer specs us terms like “8GB of Ram” and “2.2GHz steady behavior processors”. o These circuits are called latches ̅̅  RAM = Random Access Memory; 8GB = 8 Billion ints o Latch, behavior:  2.2 GHz = 2.2 billion clock pulses per second  Assume that ̅ and ̅ at start ̅ ̅  1 hertz = 1 operation per second  The input sets the output to 1 which sets the output o What does this mean in circuity? to 0  How do you use circuits to store values? ̅  Setting keeps the output at 1, which maintains  What is the purpo both output values  se of a clock signal?  Currently a particular input cause particular output o Consider a same input has 3 different outputs –ex. Tickle Me Elmo  Two kinds of circuits o Combinational Cirucits (past material)  Circuits where the output values are entirely dependent and predictable from the input values o Sequential Circuit (new)  Circuits that depend on both the inputs and the previous state of the circuit  Sequential circuits  Assume that ̅ and ̅ at start, and then set to 0 ̅ o This creates circuits whose internal state can change over time  This sets output to 1, which sets the output to 0  the same input values can result in different outputs  Setting ̅ keeps the output value ̅ at 0 which o Purpose: memory values, react to changing inputs maintains both output values  Creating Sequential circuits o Essentially, sequential circuits are a result of having feedback in the circuit  Note how the circuit remembers its signal going from 10 or 01 to 11 o Some gates don’t have useful results when outputs are fed back on inputs ̅ ̅ 0 0 X X 1 1 A Q T Q T+1 0 1 X X 1 0 0
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