Synchronous Dynamic RAM is perhaps the most common form of random access memory - it’s large (MBs, vs SRAM’s KBs), it’s fast (supporting 100 MHz and higher), and it’s low cost due to the widespread use in PCs and laptops for the past few decades.
But SDRAM chips are notoriously hard to use, compared to SRAM: they’re dynamic and need special periodic “refresh” cycles to maintain their contents. They also use a multiplexed row/column address to keep the chip’s pin count low.
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