Name: RAMモジュールのテストとトラブルシューティング (RAM module testing and troubleshooting)
Uploaded: 2021-01-14T10:13:53.000Z
Duration: 16 min 43 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

So the last few videos we build pretty much all of the RAM module.

現在進行形

And in this video, I want powered up, test it out and basically convince ourselves that it's working.

You see, the clock is running and we're gonna switch to programme mode.

We have all zeroes here, so if we push the button in programme mode, it should write all zeros to memory.

All right, so it looks like we wrote, um I think I see what's going on.

So I'm just looking clothes very closely here and what I see.

So first off, I guess the kind of explain what's going through my mind here.

And whenever you see one's one thing to kind of think it may be a possibility, is that you No one is sort of the default input.

So if something's not connected, do you get a one?

Because all the inputs on all these 7400 Siri's something for L s.

Siri's chips are pulled up thio like pullup resistors on the inputs.

So that makes me think that, you know, maybe this is hooked up sort of correctly, because we could test that, actually, if we maybe set that.

So if we set that bit, it's writing that there.

But no matter what, we set these two, I'm guessing it won't change.

So that makes me think that we got this hooked up, right?

And the first thing that I noticed, um, just just inspecting it.

I see that, um, I am I might be off by by a couple are off by one here to the power.

And I see it's going to pin 15 and then also this this ground should be going to pin 15.

Okay, so I do have to do with this this input from the dip switch a bit too comes across and that goes to pin 15.

But just these two wires are are just off by one.

So I just need to shift these over to the left.

So this shift over and of course, you know, if this if this chip wasn't powered, which it wasn't, you know, the power was not connected.

Um, yes, that this chip wasn't powered than you know.

It's outputs would be would be floating and the inputs on these chips default toe ones.

And so whenever we do a write, it just it just writes all ones.

So that explains the behavior that we saw.

So if we power it up, we get some random stuff in memory there.

But with these all zeros, if we write, we get all zeros.

So let's try setting a different pattern in here and write that.

And if we go toe all zeroes here and right there, then we got all zeros.

We get random stuff, but we could put in, you know, some other pattern like that.

So looks like we are able to put whatever data we want into memory by selecting the address here, selecting the data we want here and pushing this button here to write that data in that address.

So now we gotta run mode than we should be now, using the memory address registered here, and it looks like that's pointed to address zero.

And so we're seeing what's in address zero.

Now, this case we want to go to address one we've got to kind of set are, uh, you know, the one on the bus here.

So we want to set these top three bits to zero, and then, of course, the bottom that will default toe one when we when we said our read signal here.

So this is our read and actually stop the clock for a second here.

So if we say we wantto right, I guess from the from the registers perceptions were gonna write to the bus 1000 s o.

If we set this enabled there than on the next clock pulse, we got a one in our address register.

And of course, we see the zero because we have a zero in that location of a memory.

If we want to go back to address zero, then we have to set all four of these bits low.

So let's go ahead and set that fourth bit low.

And so this signal is still in putting a ah, right signal.

So on the next clock pulse that should put a zero into the register here, and that goes to zero.

And we see the memory that the data that's in that memory location zero.

And we could try going to memory address, too.

So this should be addressed to on the next clock pulse yet puts a to there.

And then this is the data that we had stored in address location, too.

So it looks like the memory address registered is working.

Now, if we want to read this data from the bus or read this data and put it on the bus again, we're gonna connect the bus over here and we could hook up some led is just tow to see for now what's over here.

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RAMモジュールのテストとトラブルシューティング (RAM module testing and troubleshooting)

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