rom (Read only Memory)
•Dynamic cell (DRAM) -Simpler to build, smaller -More dense -Less expensive -Needs refresh -Larger memory units •Static (SRAM) -Faster -Cache
dram is material gives sound and sram is the sound itself
This is incorrect. DRAM is a digital device, and so is SRAM. DRAM and SRAM serve the same functions- temporary storage space (or random access memory, hence 'RAM') in different ways. DRAM data is typically refreshed every so often, uses more power than SRAM and is much slower, but also much cheaper and easier to manufacture in huge sizes. SRAM, such as the cache on CPUs, is much smaller and faster, and stores data until it is cleared or the computer is turned off (and in some cases, even without power) but is extremely expensive.
sram and dram
DRAM has a lower price. Further details below:
Cache needs to get results as fast as possible. With SRAM you give it the address and wait the access time (which can be very short) and then the data is on the pins. With DRAM you have to give the high part of the address, strobe Column Address Select, give the low part of the address, strobe Row Address Select, then wait for the longer access time before getting your data. Also DRAM has to be refreshed extremely often which adds about 15% overhead.
DRAM and SRAM
SRAM is less dense than DRAM because SRAM cells are made up of multiple transistors, typically 6 transistors per cell, which require more space compared to the single transistor used in DRAM cells. This extra space needed for each cell in SRAM makes it less dense in terms of storing data compared to DRAM.
sram
sram is used for cache for cache memory.
Dynamic Random Access Memory contents need to be continuously refreshed. When its contents are being refreshed, memory can not be read from nor write to. Another point to note is that DRAM is cheap to manufacture (This could be the only advantage it has to SRAM).Where as in Static Random Access Memory, memory need not to be continuosly refreshed and therefore memory can be accessed at any time. SRAM is expensive to manufacture.