Memory organization and interfacing
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Memory Organization and Interfacing. CSE 2312 Maher Al-Khaiyat. Semiconductor Memory. Capacity Kbits (Kilobits) Mbits (Megabits). Organization Number of locations => Number of address lines Size of a location => Number of data lines. Semiconductor Memory (cont’d). Speed Access time

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Memory Organization and Interfacing

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Memory organization and interfacing

Memory Organization and Interfacing

CSE 2312

Maher Al-Khaiyat


Semiconductor memory

Semiconductor Memory

  • Capacity

    • Kbits (Kilobits)

    • Mbits (Megabits)

  • Organization

    • Number of locations => Number of address lines

    • Size of a location => Number of data lines


Semiconductor memory cont d

Semiconductor Memory (cont’d)

  • Speed

    • Access time

  • Volatility

  • Programmability


Memory organization

Number of address lines

Number of locations

Number of data lines

Memory Organization


Nonvolatile memory

Nonvolatile Memory

  • Read-Only Memory (ROM)

  • Programming or Burning

    • PROM; one-time programmable

    • EPROM; erasable using UV radiation

    • EEPROM; electrically erasable

    • Flash ROM; erasable in a flash (fast time)

    • Mask ROM; mask technology


Volatile memory

Volatile Memory

  • Random Access Memory (RAM)

  • Types

    • Static RAM (SRAM)

      • does not require refreshing

      • up to four transistors per cell

    • Dynamic RAM (DRAM)

      • requires refreshing

      • one transistor (capacitor) per cell


Address decoding

D7

D0

32Kx8

A0

A15

A16

A14

A17

CS

A18

A19

WR

OE

MEMW

MEMR

Address Decoding

A19

A0

… … …

Range of addresses 08000h to 0FFFFh


Conventional memory

Conventional Memory

  • 640K of RAM

FFFFFh

ROM 256K

C0000h

BFFFFh

VDR 128K

A0000h

  • Conventional memory

  • MS-DOS OS

  • Utilities

  • Applications

  • Etc…

9FFFFh

RAM 640K

004FFh

BIOS temp data

003FFh

Interrupt vector table

00000h


Bios data area

BIOS Data Area


Dram memory banks

64K x 4

64K x 4

64K x 1

Bank 3

64K x 4

64K x 4

64K x 1

Bank 2

256K x 4

256K x 4

256K x 1

Bank 1

256K x 4

256K x 4

256K x 1

Bank 0

DRAM Memory Banks

Example configuration of 640KB RAM


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