WEBVTT 00:12.890 --> 00:19.850 Welcome to the integer boolean data types lecture and this lecture I'm going to discuss integers and 00:19.850 --> 00:23.550 moolie and Data Types of the VHDL language. 00:23.720 --> 00:25.460 First we'll start with integers. 00:25.460 --> 00:32.330 Integers are declared in the package standard integers have values that are whole numbers in a specified 00:32.330 --> 00:33.280 range. 00:33.650 --> 00:39.530 Which means if you have we can represent three but we cannot represent three point two we can represent 00:39.530 --> 00:44.540 three four but no numbers between with an integer. 00:44.540 --> 00:47.890 This allows you to use the plus and minus operators. 00:47.900 --> 00:52.910 So if you have two editors we can add them together and assign it to a third integer. 00:52.910 --> 00:55.830 This is the main advantage over a standard logic vector. 00:55.970 --> 01:00.340 However with an integer you cannot modify individual bits. 01:00.410 --> 01:06.260 So we just specify a range and we can change that number but we cannot individually select or change 01:06.560 --> 01:11.880 bits and injure as denoted by the spelling of itself. 01:11.930 --> 01:13.600 I n t g. 01:13.740 --> 01:17.330 Your example of an integer. 01:17.540 --> 01:20.750 We have our data class which is a signal. 01:20.750 --> 01:22.970 We have our signal name calling. 01:23.000 --> 01:24.560 Clock counter. 01:24.560 --> 01:29.210 And then we have our data type which is an integer specified by the integer spelling. 01:29.570 --> 01:36.200 And then the size of the integer and to specify the size of the integer we want to give it a range. 01:36.260 --> 01:43.300 So we give it a range and the keywords for that is you go range low end to the high end. 01:43.310 --> 01:48.110 So in this case we give it a range of 0 to max clock count. 01:48.110 --> 01:52.670 So whatever value or Max clock count as that is the size of our integer. 01:52.790 --> 01:58.910 So if our max clock count is four or integer is going to be a range from zero to 4. 01:58.940 --> 02:05.320 So that means the integer can be any whole number between means 0 1 2 3 and 4. 02:05.480 --> 02:08.630 And so that is how you initialize an integer. 02:08.630 --> 02:15.860 Also we can use integers in the generic which is commonly used example we have a generic called baud 02:16.220 --> 02:21.890 and we get the data type integer and we are giving it the value 1 9 2 0 0. 02:21.890 --> 02:25.880 Now if you notice in the generic We didn't give it a range. 02:25.880 --> 02:31.970 If you don't get your integer range it would default to 32 bits or depending upon whichever compiler 02:31.970 --> 02:39.440 or synthesizer you're using it will give it a specified range and a commonly is a 32 bit integer so 02:39.440 --> 02:43.670 it's like 0 to 65000 or some really large number. 02:43.880 --> 02:48.100 So if you really want to make sure that you're not using more resources then you need to. 02:48.250 --> 02:56.120 You can specify the range that you are the Enter to be the next type of talk about is able in a way 02:56.120 --> 02:58.550 and is also declared in the package standard. 02:58.640 --> 03:01.080 It can be either a 1 or a. 03:01.100 --> 03:02.580 True or false. 03:02.810 --> 03:09.740 In this case a one is equal to a true A zero is equal to a false as denoted by the keywords boolean 03:09.770 --> 03:12.270 B 0 0 0 0 0. 03:12.530 --> 03:15.980 An example of a boolean. 03:15.980 --> 03:19.790 We're going to specify the most commonly used in a generic. 03:19.970 --> 03:27.210 So we have a name which is synchronous reset the datatype specified boolean and then the boolean value. 03:27.230 --> 03:29.280 And here we're indicating it is true. 03:29.450 --> 03:32.910 So we could type in either true or zero or 1. 03:33.110 --> 03:35.620 Or false. 03:35.630 --> 03:38.780 Now we've covered all the data types supported by VHDL. 03:38.780 --> 03:40.250 Let's learn about the syntax.