2. Αποθήκευση Δεδομένων.pdf

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Αρχιτεκτονική Μηχανής Αποθήκευση ∆εδομένων

Transcript of 2. Αποθήκευση Δεδομένων.pdf

  • AND, OR, XOR (exclusive or) Boole

  • AND, OR, XOR, NOT (inputs) (output) ()

  • AND, OR, XOR, NOT (inputs) (output)

  • flip-flop

  • (output) flip-flop 11()

    . 11

  • (output) flip-flop 11()

    . 11

    OROR 11 , ANDAND

  • (output) flip-flop 11

    .

    11 ANDAND OROR 00

  • flip-flop

  • 1 byte

  • / (RW)

  • (format) CD

    (track), (sectors)

  • /

    (R/W)

  • (records)

  • Hello. ASCII

  • () ()

    .

    .

  • 100101100101

    bit

  • 1. .

    2. , .

    3. , .

  • 13

  • : bit map.bit map.

    , pixels (picture element). pixel :

    , (RGB RedGreenBlue). MB.

    . vector.vector.

    . .

    , . (scalable fonts, ..

    TrueType, PostScript) . CAD (Computer-Aided Design).

    .

  • 0, 1.5, 2.0, 1.5, 2.0, 3.0,4.0, 3.0, 0

  • 101.101101.101

    bit

  • 2. . . .

  • --66 bits

    66 bitsbits

    --66 bitsbits

    bitsbits 11

    bits bits

  • 10 10

    2 2

    10 10

  • (excess-8)

  • bit

  • Bit Bit

    ()()

    BitBit

  • 2 5/8

    2 2

    bitbit

    bitbit

    Bit Bit

    ()()

  • xyxxyzyxyxxyzy (5, 4, x)(5, 4, x)

    . () 5 .. () 5 .

    . 4 . 4 bitbit . .

    . 4 . 4 bitbit . .

    . . , . , .

  • ASCII A F (odd parity)

    ASCII ASCII A A

    1 1

    ASCII ASCII F F

    1 1

    ( (pattern) pattern) 1 1

    ( (pattern) pattern) 1 1

  • (error-correcting code)

  • 010100

    AND, OR, XOR (exclusive or) Boole AND, OR, XOR, NOT (inputs) (output) () AND, OR, XOR, NOT (inputs) (output) flip-flop (output) flip-flop 1 () (output) flip-flop 1 () (output) flip-flop 1 flip-flop 1 byte (format) CD (records) Hello. ASCII () () 100101 13 0, 1.5, 2.0, 1.5, 2.0, 3.0,4.0, 3.0, 0 101.101 2 -6 bits (excess-8) bit 2 5/8 xyxxyzy (5, 4, x) ASCII A F (odd parity) (error-correcting code) 010100