https://www.bencode.io/categories/cpu/ Recent content in Cpu on Benny Simmonds Hugo -- 0.149.1 en-us Sat, 22 Oct 2022 13:13:13 +0000 https://www.bencode.io/posts/8bit/ Sun, 12 Jul 2020 20:08:55 +0000 https://www.bencode.io/posts/8bit/ <p>This material is based on the high quality <em>build your own CPU</em> guide by <a href="https://eater.net/8bit">Ben Eater</a>. Ben cites the SAP-1 CPU architecture as the design inspiration for the CPU, which originated from the book <a href="https://www.amazon.com.au/Digital-Computer-Electronics-Albert-Malvino/dp/0028005945">Digital Computer Electonics</a> by Albert Paul Malvino.</p> <blockquote> <p>The SAP (Simple As Possible) computer has been designed for you, the beginner. Its purpose, to introduce the crucial ideas behind a CPUs operation without burying you in unnecessary detail.</p></blockquote> <ul> <li><a href="#architecture">Architecture</a></li> <li><a href="#general-electonics">General Electonics</a> <ul> <li><a href="#dirty-power">Dirty power</a></li> <li><a href="#resistors">Resistors</a></li> <li><a href="#capacitors">Capacitors</a></li> <li><a href="#latch-vs-flip-flop">Latch vs flip flop</a></li> <li><a href="#d-flip-flop">D flip flop</a></li> </ul> </li> <li><a href="#the-clock">The clock</a></li> <li><a href="#the-registers">The registers</a></li> <li><a href="#arithmetic-and-logic-unit-alu">Arithmetic and Logic Unit (ALU)</a> <ul> <li><a href="#design">Design</a></li> <li><a href="#implementation">Implementation</a></li> <li><a href="#representing-negative-numbers---signing-bit-1s-and-2s-complement">Representing negative numbers - signing bit, 1&rsquo;s and 2&rsquo;s complement</a> <ul> <li><a href="#ones-complement">Ones complement</a></li> <li><a href="#two-complement">Two complement</a></li> </ul> </li> </ul> </li> <li><a href="#program-counter-pc">Program Counter (PC)</a> <ul> <li><a href="#pc-module-problem-1-counter-clearing">PC module problem 1: counter clearing</a></li> <li><a href="#pc-module-problem-2-dirty-clock-signal">PC module problem 2: dirty clock signal</a></li> </ul> </li> <li><a href="#output-register">Output register</a> <ul> <li><a href="#arduino-nano-eeprom-programmer">Arduino Nano EEPROM programmer</a></li> <li><a href="#binary-to-decimal-7-segment-decoder">Binary to decimal 7-segment decoder</a></li> <li><a href="#multiplexing-four-7-segment-displays-with-a-single-eeprom">Multiplexing four 7-segment displays with a single EEPROM</a></li> </ul> </li> <li><a href="#handy-resources">Handy resources</a></li> </ul> <h2 id="architecture">Architecture</h2> <p>The SAP-1 defines a number of logical CPU modules which are capable of integrating to form a working CPU and ultimately computer.</p>