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43 lines
1.2 KiB
Markdown
43 lines
1.2 KiB
Markdown
---
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title: "03-sequential-logic-circuits"
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aliases:
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tags:
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- cosc204
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- lecture
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sr-due: 2022-07-26
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sr-interval: 3
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sr-ease: 250
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---
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comb log. circuits always produce the same output with the same inputs
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Sequential logic circuit output depends not only on the inputs but also past history (memory)
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Two types:
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- synchronous
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- changes of state happen in time with a clock cycle
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- input changes occur between clock pulses
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- state changes occur at the clock pulses
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- asynchronous
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- We will not be studying these
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- State changes occur as changes in inputs occur
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- Event driven
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# Memory circuits
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- Set-reset latch [sr latch](https://i.imgur.com/mhXd77i.png)
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- D-type flip-flop [delay flip flop](https://i.imgur.com/IpQfNRm.png)
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- T-type flip-flop [t flip flop](https://i.imgur.com/SZn2J94.png)
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- JK-type flip-flop [jk flip flop](https://i.imgur.com/OgfTehO.png), [jk flip flop 2](https://i.imgur.com/8zJvDuw.png)
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- synchronous counter [simulation](https://tinyurl.com/25olydjb), [slide](https://i.imgur.com/81LS7HL.png)
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# State transition
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"if you are here and you get this then go here"
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basis of all computing (turing machine)
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The computer memory is the current state, the instruction is where to go next |