19 Facts About SDRAM

SDRAM has a synchronous interface, whereby changes on control inputs are recognised after a rising edge of its clock input.

SDRAM latency is not inherently lower than asynchronous DRAM.

Indeed, early SDRAM was somewhat slower than contemporaneous burst EDO DRAM due to the additional logic.

Today, virtually all SDRAM is manufactured in compliance with standards established by JEDEC, an electronics industry association that adopts open standards to facilitate interoperability of electronic components.

Double data rate SDRAM, known as DDR SDRAM, was first demonstrated by Samsung in 1997.

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SDRAM is available in registered varieties, for systems that require greater scalability such as servers and workstations.

Today, the world's largest manufacturers of SDRAM include: Samsung Electronics, SK Hynix, Micron Technology, and Nanya Technology.

SDRAM devices are internally divided into either two, four or eight independent internal data banks.

Later double-data-rate SDRAM standards add additional mode registers, addressed using the bank address pins.

For example, DDR2 SDRAM has a 13-bit mode register, a 13-bit extended mode register No 1, and a 5-bit extended mode register No 2 .

The SDRAM maintains an internal counter, which iterates over all possible rows.

SDRAM designed for battery-powered devices offers some additional power-saving options.

DDR SDRAM employs prefetch architecture to allow quick and easy access to multiple data words located on a common physical row in the memory.

DDR2 SDRAM is very similar to DDR SDRAM, but doubles the minimum read or write unit again, to four consecutive words.

Unlike SDRAM, there were no per-chip select signals; each chip was assigned an ID when reset, and the command contained the ID of the chip that should process it.

VCM was a proprietary type of SDRAM that was designed by NEC, but released as an open standard with no licensing fees.

Unlike a normal SDRAM write, which must be performed to an active row, the VCSDRAM bank must be precharged when the restore command is issued.

Graphics double data rate SDRAM is a type of specialized DDR SDRAM designed to be used as the main memory of graphics processing units .

GDDR SDRAM is distinct from commodity types of DDR SDRAM such as DDR3, although they share some core technologies.