1 00:00:04,210 --> 00:00:11,380 ‫Welcome to the barrel shifter demonstration with the ardy the seven board I have the bear shifter lab 2 00:00:11,440 --> 00:00:21,460 ‫running on my Arties the 7 board where I have all the four digit seven segment display as well as three 3 00:00:21,520 --> 00:00:25,690 ‫electronic slide switches with the 7 segment display. 4 00:00:25,840 --> 00:00:33,820 ‫I have each one of the segments running back there are a 56 ohm resistor that I have tied in to my to 5 00:00:33,820 --> 00:00:37,710 ‫the J port of the Arties the 7 board. 6 00:00:37,810 --> 00:00:42,320 ‫Then I also have the four digit selects on the on the seventh. 7 00:00:42,320 --> 00:00:51,820 ‫I mean display running through a to an of 4 transistor with a 470 ohm resistor connected to the base 8 00:00:51,970 --> 00:01:01,180 ‫of the transistor fed back into the J.B. port of the Arty's the seven and then I have the three slide 9 00:01:01,180 --> 00:01:08,420 ‫switches also fed into the J.B. port of the Arty's seven development board with the barrow shifter. 10 00:01:08,420 --> 00:01:15,110 ‫The three slide switches are used to indicate the amount that I want to shift to the left or to the 11 00:01:15,110 --> 00:01:15,910 ‫right. 12 00:01:16,160 --> 00:01:23,990 ‫And then I have the switch 0 and switch one are used to indicate which way what the operation was going 13 00:01:23,990 --> 00:01:24,830 ‫to perform. 14 00:01:24,950 --> 00:01:28,260 ‫If I have them both 0 that's a hold. 15 00:01:28,400 --> 00:01:31,930 ‫If I have a zero in a one that will give me a shift right. 16 00:01:31,940 --> 00:01:35,990 ‫Operation 5 a 1 or 0 then is there. 17 00:01:35,990 --> 00:01:43,460 ‫That gives me a shift left operation and if I have them both high at one one that gives me a load operation 18 00:01:44,030 --> 00:01:50,660 ‫and then my button zero is what is going to operate as the clock for the barrel shifter just so we can 19 00:01:50,660 --> 00:01:53,750 ‫see every time I push the button what's actually happening. 20 00:01:53,750 --> 00:01:58,880 ‫So right now I have switched 0 and switch one both in one one position. 21 00:01:58,940 --> 00:02:04,100 ‫So this is going to load which we have a preconfigured value of 128. 22 00:02:04,100 --> 00:02:09,200 ‫We're going to load into our shift register which will be displayed on the set of saving display. 23 00:02:09,210 --> 00:02:16,270 ‫So when I pressed button 0 we'll see a value of 128 loaded onto the segment display. 24 00:02:16,310 --> 00:02:25,490 ‫Now with the barrel shifter what we can do is perform a shift right operation by having switch one down 25 00:02:25,490 --> 00:02:29,300 ‫to zero and leaving switch 0 up to 1. 26 00:02:29,300 --> 00:02:35,110 ‫So with this operation we're going to shift right to the amount that's indicated on the slide switches 27 00:02:35,270 --> 00:02:38,780 ‫on the breadboard with the light switches on the breadboard. 28 00:02:38,780 --> 00:02:45,240 ‫If they're shifted to the right that means there are one or high high if they're shifted to the left. 29 00:02:45,260 --> 00:02:47,330 ‫That means there is zero or pulled low. 30 00:02:47,540 --> 00:02:49,620 ‫So right now we have our shift out. 31 00:02:49,640 --> 00:02:57,610 ‫We've got 001 which means we're going to shift right one bit which every bit you shift is a divider 32 00:02:57,620 --> 00:02:59,240 ‫multiply by two. 33 00:02:59,270 --> 00:03:02,800 ‫Since we're shifting to the right it's a divide by two. 34 00:03:02,810 --> 00:03:05,830 ‫So if we take 128 we divide it by two. 35 00:03:05,900 --> 00:03:06,930 ‫We'll see a value. 36 00:03:06,980 --> 00:03:10,890 ‫We should see a value of 64 on the 7st display. 37 00:03:11,180 --> 00:03:17,030 ‫And when I press this button 0 it's going to simulate a clock pulse on my barrel shifter. 38 00:03:17,060 --> 00:03:24,650 ‫So when I press the button zero you'll see we now have a value of 64 in on our shift register or a barrel 39 00:03:24,650 --> 00:03:25,450 ‫shifter. 40 00:03:25,670 --> 00:03:31,220 ‫And if I press it again we'll divide by two once more which will take us down to thirty two and I can 41 00:03:31,220 --> 00:03:33,600 ‫press this once again to get down to 16. 42 00:03:33,680 --> 00:03:39,270 ‫And again we're down to eight and also down to four as well as two. 43 00:03:39,270 --> 00:03:46,710 ‫Now if I want to go ahead and test the other way shift a shift left operation which performs the multiplication 44 00:03:46,710 --> 00:03:47,590 ‫by 2. 45 00:03:47,640 --> 00:03:55,080 ‫So if I take and switch my slide switches so that now I have a 1 0 which indicates a shift left and 46 00:03:55,140 --> 00:04:03,540 ‫I'll keep my shift amount to 0 0 1 so I'll still be shifting by one bit which is simulating a multiply 47 00:04:03,540 --> 00:04:04,520 ‫by two. 48 00:04:04,530 --> 00:04:16,050 ‫So if I press up to four to eight 16 32 64 and then back up to 128 and I can shift down by any various 49 00:04:16,050 --> 00:04:23,550 ‫amount but that the key to know here is that if I'm able to perform this multiplication or division 50 00:04:23,960 --> 00:04:29,100 ‫indivisibility of two and just one clock pulse which is the key of a barrel shifter you can perform 51 00:04:29,100 --> 00:04:33,120 ‫this multiplication using other algorithms but it takes multiple calk pulses. 52 00:04:33,120 --> 00:04:38,760 ‫So if I want to go from 128 and if I buy two or take any value in there and divide it by two I can do 53 00:04:39,180 --> 00:04:42,480 ‫a barrel shifter to make it happen in one clock cycle. 54 00:04:42,630 --> 00:04:47,880 ‫And so that is the implementation demonstration of the barrel shift are running on already of the seven.