039 MultiCycle Microcode Building a CPU From Scratch

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=H41UohXvvlE

To load and store from slow memory, we need to be able to wait for that memory to finish. To do this, let's implement a microcode sequencer and the ability to loop until memory is finished! This implements memory request and acknowledge. • • This is in a CPU built from scratch using Digital, a digital logic simulator we can use to build a CPU that can run on an FPGA. • See the project on github here: https://github.com/rj45/rj32 • Get the program I am using here: https://github.com/hneemann/Digital/r... • Get the assembler I am using here: https://github.com/hlorenzi/customasm • If you would like to support this work and encourage me to make more videos: • https://ko-fi.com/rj45_creates • • 00:00 - Intro • 01:10 - Possibilities • 02:30 - Microsequencer Circuit • 03:18 - Step Register • 04:47 - Microcode Memory Layout • 06:25 - Op or Step • 08:58 - Microsequencer Integration • 09:33 - Microcode Updates • 14:14 - Wiring the Next Field • 15:21 - Testing Halt/Error • 15:54 - Stall and Fetch Explanation • 17:30 - Inhibiting Fetch • 20:24 - Testing Fetch Inhibition • 21:00 - Inhibiting Stall • 22:11 - Testing Stall Inhibition • 22:28 - Fixing Skip With Enable • 25:19 - Testing Skip • 25:43 - Deciding With Flags • 30:05 - Microcode For Decisions • 34:35 - Memory Req and Ack • 37:09 - Testing Req and Ack • 38:07 - Summary • • • Digital Logic Introduction: • Exploring How Computers Work - • Exploring How Computers Work • How Do Computers Remember? - • How Do Computers Remember? • • Deeper dive into how to build a computer from scratch: • Ben Eater's 8-bit Breadboard Computer - • 8-bit computer update

#############################

New on site