CEE 5244 Lecture Notes - Lecture 14: Inside Out Music, Magnetic Domain, Magnetic Storage
5 Apr 2016
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Lecture 14: nobody on earth understands pentium chip inside-out. Let a computer design the gate arrangements (eyes closed!: data storage, within the computer, data is stored in volatile memory (ram) Also possible to rig two nand gates to hold one bit: called a flip-flop. Volatile because it goes away when turned off: also store data permanently, usually on magnetic media (floppies, hard drives, tapes) or on optical discs (cd-roms, dvds) Information encoded as polarization of magnetic domains. Older technology used wire coils around ferrite cores (like transformer) to detect/generate magnetic fields: example: flip-flop memory, this simple arrangement of two nand gates retains a memory: Imagine a and b are in the high state (both 1) C = 0, d = 1 is valid, but so is c = 1, d = 0. Can set the state by dropping a or b low momentarily. Even our beloved in-class infrared transmitters: today, we"ll look at a number examples.
