Question

Q1/

a)Why SDRAM is faster than DRAM

b)why the speed will not always doubled in DDR memory

c)design a diode matrix Rom to detect whether a five bits odd input value has three or more ones in thier binary form,

d) Explain in details with the aids of reasons and illustrating figures if

any what is and why the existence of differences between access time

and capacity of DRAM and SRAM.

The topic is the memory microprocessor ,i need in half of hour،thank

Answer 1

Q) a. Ans - SDRAM i.e synchronous dynamic random access memory is faster than DRAM because its system clock is synchronous with clock speed of CPU of computer at 133 MHz (Mega hertz) .it allows much higher clock speeds ( 3 times) than DRAM.

Q) b. Ans - DDR SDRAM ( Double data rate SDRAM). SDRAM transfers data on one edge only but DDR SDRAM fetches data on both the leading edge and falling edge of clock signal.it can't be faster than doubled because it is synchronized with the clock. We can't manipulate in the clock.

Q) d. Ans - speed - SRAM is faster because it does not need to refresh, thats why it is faster.

Access time of DRAM is about 60 nanoseconds while SRAM has low like 10 nanoseconds.

CAPACITY - SRAM needs more transistor to store data while DRAM module requires only one transitor and one capacitor to store every bit of data. SRAM need 6 transistor for that purpose.