8-bit CPU control logic: Part 2

2017-04-30

[public] 170K views, 5.66K likes, 16.0 dislikes audio only

In this video, we talk about the difference between instructions and microinstructions. Then we build a ring counter to keep track of where we are in the instruction cycle. Finally, we hook up a quick-and-dirty implementation of the fetch cycle to demonstrate instruction fetching. See https://eater.net/bbcpu8-control-logic for more.

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Using an EEPROM to replace combinational logic by Ben Eater
/youtube/video/BA12Z7gQ4P0

hook the clock up to the computer
/youtube/video/X7rCxs1ppyY?t=224.89

changing the control word between clock cycles
/youtube/video/X7rCxs1ppyY?t=276.51999

take the output of the clock
/youtube/video/X7rCxs1ppyY?t=311.47

inverting the clock
/youtube/video/X7rCxs1ppyY?t=339.48999

connect this inverted clock down to the micro instruction counter
/youtube/video/X7rCxs1ppyY?t=346

hook up some leds
/youtube/video/X7rCxs1ppyY?t=432.70001

use one of these outputs to reset the counter
/youtube/video/X7rCxs1ppyY?t=471.04001

work the fetch cycle for each of these instructions
/youtube/video/X7rCxs1ppyY?t=671.88

speed up the clock a bit
/youtube/video/X7rCxs1ppyY?t=937.47998

Building an 8-bit breadboard computer! by Ben Eater
/youtube/video/HyznrdDSSGM

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8-bit CPU control logic: Part 3 342,431 views
/youtube/video/dHWFpkGsxOs