…. requires the supporting refresh circuitry

SRAM is static because stored bits do not need to be refreshed

in SRAM The data bit is stored on cross-coupled inverters

if noise degrades the value of the stored bit, the cross-coupled inverters restore the value

DRAM cell is … and … than SRAM cell

DRAM is … dense and … expensive than SRAM

smaller cells=… cells per unit area

SRAMs (used for cache memory ) are generally faster than DRAMs (used for main memory)

SRAMs, and DRAMs are all volatile memories

Different memory technologies, such as DRAM, SRAM, and hard drives, offer trade-offs in capacity, speed, and cost

To deal with this disparity, computer systems use a combination of memory types to provide the best performance at the best cost. This approach is called

The faster memory is, the more expensive it is per bit of storage

Main memory is typically built from DRAM, which is significantly faster than the processor.

Computers store the most commonly used instructions and data in a faster but smaller memory, called a ….

The cache speed is comparable to the processor speed

Memory is classified according to its distance from the processor, the closer memory is the slower one

the processor retrieves the data from main memory (DRAM). This is called a cache ..

If the processor requests data that is available in the cache, it is returned quickly. This is called a cache ..

the requested data resides in cache

the requested data is not found

If the cache hits most of the time, then the processor seldom has to wait for the slow main memory, and the average access time is ….