WEBVTT 00:00.120 --> 00:05.040 Second scenario right there very well, and the signals are useful, right? 00:05.310 --> 00:10.050 So you have design went off a system where they just knew this, as you well know. 00:10.710 --> 00:15.180 And then we have a duty to write down in between, right? 00:15.660 --> 00:18.030 So in between, you have this condition, right? 00:18.240 --> 00:19.740 So if you considered duty one. 00:20.620 --> 00:25.470 OK, so when you write an entity, you declare a b c d later. 00:25.470 --> 00:32.760 The two input ports are already declaring an entity, and CND is also declared in an entity which represent 00:32.760 --> 00:34.520 an output system. 00:34.740 --> 00:36.600 So this is our system. 00:37.080 --> 00:37.440 OK. 00:37.710 --> 00:45.540 So when we consider an entity of a system, we declare E B C and but McGill be finding we have subsystem 00:45.540 --> 00:50.220 one that is due d one and subsystem three, which is due to an in between. 00:51.730 --> 00:56.680 And in between, we have units which are not defined in the name, right? 00:56.860 --> 01:04.840 So we could clearly see IB CDs defined, but this two nets OK, one and two is not defined in an integer, 01:04.840 --> 01:05.080 right? 01:05.080 --> 01:10.630 So the second usage of the signal is to define. 01:11.760 --> 01:12.750 Undefined. 01:14.060 --> 01:15.100 Next. 01:15.260 --> 01:19.070 OK, so this is the second usage that we have. 01:20.450 --> 01:26.840 For an undefined right, so these are the two primary uses that you you would easily understand, OK, 01:27.440 --> 01:32.930 that give us a motivation to understand, signal and ready, but right now, signal a variable will 01:33.740 --> 01:34.610 have the. 01:35.710 --> 01:42.670 D-Day, depending on what we specify, right, so the evil you required and specify the type for both 01:42.670 --> 01:45.950 signal and variable and then only a good process. 01:45.970 --> 01:53.130 So two of the usage of signal and variable that you would keep in the mind, at least for this section, 01:53.140 --> 01:59.170 OK will be first to re-use any value. 01:59.510 --> 01:59.800 Right. 01:59.800 --> 02:06.700 So if you want to use any of value, then you need to use signal a lot, even if you want to have a 02:06.700 --> 02:11.980 temporary, OK temporary variable for storage. 02:12.340 --> 02:12.690 OK. 02:14.080 --> 02:20.920 Then also, you could either proceed with Signal already, but the third import and usage of the signal 02:20.920 --> 02:25.330 and variable is to define and define it. 02:25.900 --> 02:27.970 This is the third usage of. 02:29.260 --> 02:38.530 Signal already, but the important point to remember is the signal signal have a global scope. 02:38.860 --> 02:39.190 OK. 02:39.510 --> 02:48.130 While, well, very are local to the process rates, they have a local scope and which is restricted 02:48.130 --> 02:49.660 to the specific process and. 02:50.890 --> 02:52.660 In which we have declared. 02:52.870 --> 02:53.170 Right. 02:53.470 --> 02:54.520 So these are the four. 02:55.480 --> 02:57.010 Important point to remember. 02:57.190 --> 03:00.280 In fact, the D-type that signal and variability. 03:01.230 --> 03:06.780 Depends on how what do their abuser have assigned them right away, like letting cigarette video of 03:06.780 --> 03:09.660 it that we need to specify that iPods? 03:09.810 --> 03:10.110 Right? 03:10.500 --> 03:16.170 So let me just proceed and try to cover some of the fundamental of signal and video. 03:16.170 --> 03:22.500 But now, in fact, will not be going into detail of each of this because as we progress to the modeling 03:22.500 --> 03:25.380 state there, we will be frequently utilizing them. 03:25.380 --> 03:29.250 So much of the things will be clear when we build up an actual systems. 03:29.460 --> 03:31.470 So here our agenda will be just to get. 03:32.830 --> 03:39.940 What view of a signal line, believe it, so that as we progress further in the marketing say, things 03:39.940 --> 03:41.580 will be much easier for Mr. 03:41.630 --> 03:41.830 Right. 03:41.840 --> 03:43.650 So we frequently require them. 03:44.020 --> 03:50.140 So instead of proceeding to the modeling, say we are first discussing them and then we will proceed 03:50.140 --> 03:51.480 to modeling state.