I have been doing some more digging on this concept because it is so interesting.

A ferrite core has four wires weaved through it:

ADDR_X
ADDR_Y
SENSE
INHIBIT

Ferrite core memory performs destructive reads, as the only way to SENSE what was stored in the core is by attempting to flip its polarity.

Current needed to flip a core is about 200mA for a core with an outer diameter of 0.45mm.

Let me say that again: 1 bit took 200mA to read or write! (Ampère’s Law)

#Memory
#HWDesign
#ESP32