Description

Displaying numbers is trickier than I expected! In this video we explore how to visualize the data inside of our simulated 4-bit registers, with the help of the double dabble algorithm and some seven segment displays. The latest version of the simulation software is now available here: https://sebastian.itch.io/digital-logic-sim And the source code is here: https://github.com/SebLague/Digital-Logic-Sim Correction for a mistake in my boolean algebra explanation: https://www.youtube.com/watch?v=A-vLRThfJ4Q Series playlist: https://youtube.com/playlist?list=PLFt_AvWsXl0dPhqVsKt1Ni_46ARyiCGSq If you'd like to support my work (and get early access to new videos and projects), consider becoming a patron of the channel over here: https://www.patreon.com/SebastianLague Resources and Inspiration: https://en.wikipedia.org/wiki/Double_dabble https://electronics.stackexchange.com/questions/499884/3-digit-of-7-segment-on-logisim/499916#499916 https://pdf1.alldatasheet.com/datasheet-pdf/view/5697/MOTOROLA/SN54/74LS248.html Music: https://github.com/SebLague/Misc-Project-Info/blob/main/Digital-Logic-Sim/7Seg%20Music%20Credits.txt Chapters 0:00 Intro 0:49 Two’s Complement Refresher 1:34 Seven-Segment Display + Truth Table 2:58 Boolean Algebra Basics 5:43 Simplifying the Equation 6:48 Converting Algebra to Logic Gates 8:33 Computer-Assisted Design 11:25 Testing the Digit Display Design 12:36 A Real-World Version (the 74LS248) 14:20 Visualizing the Data in a 4-bit Register 15:14 All Ten Digits 17:22 Binary Coded Decimal 19:49 The Double Dabble Algorithm 22:58 Dabbling with Logic Gates 24:05 Implementing Double Dabble 26:39 Displaying an 8-bit Number 27:18 Ripple Blanking 29:32 Displaying Negative Numbers 32:34 Testing the Final Design 33:50 Outro