I. Random Access Memory

What is it ?

II. Summary

• EDO

• SDRAM

• RAMBUS

• ECC

• DDR SDRAM

III. EDO (Extended Data Out)

• 1995

• Can address the next column when reading a column

• 50 to 60ns

• 33 to 66MHz

• Dead when SDRAM appeared

IV. SDRAM (Synchronous Dynamic RAM)

• 1997

• Synchronous Access with the bus clock

• 10ns

• up to 150MHz

• 1,2Go/s

V. DDR SDRAM (Double Data Rate SDRAM)

• 2000

• Double Rate with same frequency

• 10ns

• up to 150MHz

• 2,4Go/s

VI. RAMBUS

• 1997

• Synchronous Access with the bus clock

• 10ns

• up to 800MHz

• 1,6Go/s

VII. ECC (Error-correcting code)

• Detect and correct memory corruption

• Detect with sum of contro

• Correct with redundancy

• Used in financial and scientific computing more than for everyone

VIII. Now ? DDR4 SDRAM

double data rate fourth-generation synchronous dynamic random-access memory

• 2014

• 10ns

• up to 2400MHz

• 19,2Go/s

ANY

QUESTIONS

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