flip-flop latch as a storage element in all processors
Memory is the space where we can store our data. we have lot of memory devices pendrive, floppy, blu-ray disc,compact disc,dvd etc. but inside the micro-processors and micro-controller we used flip-flop as a memory devices. each flip flop can carry 1 bit. 1 bit mean it can carry either 1 or 0. 1 or 0 binary states. actually it is the potential difference between terminal. Q or Q bar .generally voltage level or capacitive charge representing 1 or 0. a flip flop latch is the basic element of memory.to write or store a bit in the latch , we need an input data bit Din and an enable signal . in this latch the stored bit is always available on the output line D out . to avoid unintentional charge
in the input and control the availability of the output. we can use two tri state buffer on the latch , hai now we are started to write something into the latch by enable the input buffer and read the from it by enable the output buffer . write signal as WR bar and the read signal RD bar , these are
active low signal s indicated by bar. This latch which can store one binary bit,is called a memory cell.if 4 or more latche together it is called register. there is 8 bit register , 32 bit register( most of the home computer are 32 bit) and also 64 bit . 64 bit are used for high performances computers. here we deal with 4 bit register. the 4 bit register have 4 input and output and can store 4 bit.
then we moved to 8 bit register . i asked one question what is 8 bit register?
8 bit register : this have 8 flip flop and 8 input and output . if we used register , we use decoder to select each register.for example if we want to select 3 rd register. assume that we use 2-4 decoder 2 input and 4 output. to activate the 3 rd output should got to high ( for active low it should be 0 ) . when we applied 1,0 to the input ( A=1, B=0) then we get 3 rd output as high.
this for having single chip. when the number of chip increase we use another method.we have one decoder which is used to select the chip
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thank you.Labels: Micro-Processors