13 Facts About SDR SDRAM

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.

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

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 .

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

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

Originally simply known as SDRAM, single data rate SDRAM can accept one command and transfer one word of data per clock cycle.

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

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.