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What is static ram pdf5/25/2023 ![]() Many people refer to a processor’s RAM as simply “DDR”, using the terms interchangeably because DDR is so widely used as CPU RAM and has been since the late 1990s. Synchronous data lends itself to faster operation when coordinating memory fetches with the processor’s requirements. DDR SDRAM means that this type of SDRAM fetches data on both the leading edge and the falling edge of the clock signal that regulates it, thus the name “Double Data Rate.” Prior to DDR, RAM would fetch data only once per clock cycle. However, SDRAM transfers data on one edge of the clock. Because DRAM was asynchronous, it was not going to work as fast with processors that were just getting faster.įigure 1: Four (4) GB of DDR4 SDRAM on a DIMM (Credit: smial, Wikimedia Commons)SDRAM is synchronous, and therefore relies on a clock to synchronize signals, creating predictable orderly cycles of data fetches and writes. ![]() This posed a problem in organizing data as it comes in so it can be queued for the process it’s associated with. DRAM is asynchronous, i.e., not synchronized by any external influence. First on the scene of this stack of acronyms was Dynamic Random-Access Memory (DRAM), introduced in the 1970s. Double Data Rate (DDR) Synchronous Dynamic Random Access Memory (SDRAM) is a common type of memory used as RAM for most every modern processor.
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