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Static Memory. Static Memory. Static Memory Systems. Those semiconductor components in a microcomputer that store the program and data.

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Static memory

Static Memory

Lecture 14 - Static Memory


Static memory1
Static Memory

Lecture 14 - Static Memory


Static memory systems
Static Memory Systems

  • Those semiconductor components in a microcomputer that store the program and data.

  • Role in the system can be seen as passive – memory simply stores information and except for specialized architectures, performs no operation on the data stored there.

  • Today it is common to have yyG bytes in a system.

Lecture 14 - Static Memory


Ram characteristics
RAM Characteristics

  • Forms the bulk of memory in a system.

    • Today the bulk memory is typically a flavor of DRAM

  • Is read/write memory.

  • For read/write memory have choice of

    • Static RAM

    • Dynamic RAM

  • Special Characteristic Memory

    • ROM (PROM, EPROM, EEPROM)

    • EEPROM partially used as RAM

    • Computational Memory

Lecture 14 - Static Memory


Static ram
Static RAM

  • Nonvolatile – as long as power is on value is retained with no other action.

Lecture 14 - Static Memory


Gate equivalent
Gate Equivalent

Lecture 14 - Static Memory


1 st approach to 16k of ram
1st approach to 16K of RAM

Lecture 14 - Static Memory


2 nd approach to 16k of ram
2nd approach to 16K of RAM

Lecture 14 - Static Memory


Internals of 6264lp static cmos ram
Internals of 6264LP Static CMOS RAM

Lecture 14 - Static Memory


A ram chip
A RAM Chip

  • 6264LP-10

  • -10 means 100ns access time

  • Consider all parameters

Lecture 14 - Static Memory


Bus contention
Bus Contention

  • Read after read to same chip

  • Must consider what happens in preceding cycle and what happens in next cycle

  • Must also consider read after write, write after read, and write after write timing

  • Timing for the same chip and for different chips

Lecture 14 - Static Memory


Read cycle bus contention
Read cycle bus contention

Lecture 14 - Static Memory


Write cycle bus contention
Write cycle bus contention

Lecture 14 - Static Memory


Prom and eprom
PROM and EPROM

  • Programmable Read Only Memory

    • One time programmable

  • Electrically Programmable Read Only Memory

    • Programmed by provided a higher than normal programming voltage – 12V to 25V

    • UV erasable

  • Used to program and code startup code – the bios in a PC

Lecture 14 - Static Memory


Prom and eproms
PROM and EPROMS

  • Come in many sizes

  • Byte wide is very common

  • Worldwide is also common

Lecture 14 - Static Memory


Eeprom
EEPROM

  • Another form of non-volatile memory

  • Read cycle is like other PROMs

  • Write cycle timing is long – typically over 100 us.

Lecture 14 - Static Memory


Eeproms and flash eeproms
EEPROMs and flash EEPROMs

  • Flash EEPROMs are similar to electrical erasable PROMs

Lecture 14 - Static Memory


Example of flash eeprom use
Example of flash EEPROM use

  • Flash EEPROMs are similar to electrically erasable PROMs

Lecture 14 - Static Memory


Wikipedia provides some info
Wikipedia provides some info

  • Wikipedia provides some useful overview of the topic of the various non-volatile technologies.

Lecture 14 - Static Memory


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