Registers and RAM: Crash Course Computer Science #6
Why Electrical Engineering Stack Exchange recommends it
Electronics Stack Exchange askers cite it as the source diagram when they get stuck on how gated latches, address multiplexers and read/write enable lines in RAM actually work.
Recommended by 0 people across 0 different months, 2018 to 2024.
What it is
A CrashCourse Computer Science episode hosted by Carrie Anne Philbin that builds memory from logic gates, starting with a gated latch that stores one bit and scaling up to a matrix of latches addressed by row and column multiplexers to form RAM. It sets up the next episode, which uses RAM and the ALU to build a CPU.
What people said
Cites kaneki · 2018-07 · Electrical Engineering Stack Exchange · on “How memory is stored in memories like SD Card, USB flash drive, etc. that the data stays even if removed to the device?”
This latches ( Gated Latch [this video] , SR Latch, and Flip Flops) can only store memory IF there is electric current flowing, but everything will go OFF if no current. I wonder how memory is stored in memories like SD Card, USB flash drive, etc. that the data stays even if removed to the device (that conducts electricity)?
Cites obe · 2019-04 · Electrical Engineering Stack Exchange · on “Why is my Gated Latch not a Gated Latch?”
After watching the excellent Carrie Anne's Crash Course Computer Science #6 ( [this video] ), I tried to design a Gated Latch in Logicly. I played with it a little, and created a design that uses four gates, whereas Carrie Anne's uses six gates. I tried it out in Logicly and it seems to work, although when the latch holds 1, and WRITE ENABLE is 0 - the output flickers. So, can anyone please point out my mistake in the design? (and also explain if and how it relates to the flicker I see on Logicly). Here is Carrie Ann's design, from the Youtube video mentioned above: [LINK] Here is mine: [LINK] Thank you!
Cites Sebastian Nielsen · 2019-07 · Electrical Engineering Stack Exchange · on “How is this multiplexer built? (on a logic gate plan)”
I was watching this CrashChourse CS video [this video] (7:41) to learn about RAM. [LINK] Real quick, this is the definition of a multiplexer: ( source [LINK] ) [LINK] MY QUESTION Since the Multiplexer only has a single output, how can I ever map each of the 16 combinatons of 4-bit input to each of the 16 columns as seen on the image above? It seems impossible as, again, it only got one output?!
Cites user14232195 · 2024-02 · Electrical Engineering Stack Exchange · on “Where do Data in /Out, Write Enable, and Read Enable Wires connect to in RAM?”
This is a screenshot of the Crash Course Video Registers and RAM #6. From YouTube, here's the link " Crash Course Video [this video] ". It's talking about using Gated latches to store memory, and putting it in a 16 x 16 grid of sorts, activating the wire to select the specific area where you want to get data from. How does the Data in/out, Write Enable, and Read Enable wire work?/Get input/Turn on from they put a ... around those wire but where does it go? Connect to? Activate? [LINK] Screenshot from: [this video]