SDRAM Memory

SDRAM Memory

What is SDRAM Memory?

• SDRAM - Synchronous Dynamic Random-Access Memory.
• Its speed rating is given in MHz to easily compare it to system board bus speeds. 
• This type of memory synchronizes its input and output signals with the incoming clock that is used in the system board. 

• By doing so, data transactions can continually take place with each successive rising edge of the clock. 
• As seen in the diagram below, the clock is used as the main determining factor for memory data operation. The memory array is composed of two banks that can be accessed independently. 

SDRAM advantages

·         SRAM: The basic entity for storage (each cell) is the flip-flop (comprised of transistors). It does have a fast access compared to others.But it's expensive and space consuming due to the the number of transistors employed.

·         DRAM: Each cell is a transistor-capacitor circuit.The capacitor acts as a storage device, whereas transistor is the controlling unit which decides if a read/write should be performed on the specific cell. Also RAM controller needs to refresh the cells at regular intervals to overcome the shortcoming of capacitor leakage

·         SDRAM: This is an succession of DRAM, except that the each operation on the RAM is synchronized with the system clock.