thomasabishop/eolas
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Autosave: 2022-12-09 18:30:05

Browse source
This commit is contained in:
thomasabishop 2022-12-09 18:30:05 +00:00
parent e50538e8c1
commit a606ebedb9
1 changed files with 6 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
Electronics/Digital_Circuits/Latches.md
View file

@ -34,6 +34,8 @@ This is represented more clearly in the table below:
| 1 | 0 | 1 | Set |
| 1 | 1 | X | Invalid, null |
Important to note that this works if we set 1 or 0 as the bit to be remembered, not just if S is set to 1. Either way, the remembered bit will be represented by _Q_ regardless of how many times we toggle _S_ after the initial setting.
_The representation of an SR Latch in a digital circuit diagram_:
![](/img/sr_latch_diagram.png)
@ -57,7 +59,7 @@ Let's talk through the logic at each state change:
- N1 is receiving 1 from S and 0 from R by way of N2. This is the inversion of OR so TF equals F.
- Hence N2 (which is the state of Q) is receiving 0 from N1 as its top input and 0 from R as its bottom input. In NOR, FF equals T hence Q is 1
- When _S_ goes to 0, _Q_ remains 1
- N2 is receiving 0 from N1 as the top input and 0 from R as the bottom input hence the overall input is FF which means NT is outputting T and Q remains 1
- N2 is receiving 0 from N1 as the top input and 0 from R as the bottom input hence the ohverall input is FF which means NT is outputting T and Q remains 1
- N1 is outputting 0 because it is receiving 0 as its top input and 1 from its bottom input
- When _R_ is set to 1, the memory bit is cleared and _Q_ becomes 0.
- N2 is receiving 1 from R as its bottom input and 1 from the output of N1 as its top input. Therefore it is outputting TT which in NOR evaluates to F hence Q is 0
@ -68,4 +70,7 @@ Let's talk through the logic at each state change:
### NAND latch
With a NAND-based memory implementation we have two inputs: _I_ which is the bit we want to store in memory and _S_ which sets it. There is a single output _O_ which
![](/img/nand_latch_logic_circuit.png)
<iframe src="https://circuitverse.org/simulator/embed/nand-mem?theme=default&display_title=false&clock_time=true&fullscreen=true&zoom_in_out=true" style="border-width:; border-style: solid; border-color:;" name="myiframe" id="projectPreview" scrolling="no" frameborder="1" marginheight="0px" marginwidth="0px" height="500" width="600" allowFullScreen></iframe>