as i discuss in the previous post about memory element and various topic that are releated to microprocessor architecture that is use in htc ,android and and many cell phones leptops etc microprocessor is the main part of any operating system and other words it is the control, basic of a mobile ,
The Basic Memory Element
The basic memory element is similar to a D latch.
This latch has an input where the data comes in. It has an enable input and an output on which data comes out.
The Basic Memory Element
However, this is not safe.
Data is always present on the input and the output is always set to the contents of the latch.
To avoid this, tri-state buffers are added at the input and output of the latch.
The Basic Memory Element
The WR signal controls the input buffer.
The bar over WR means that this is an active low signal.
So, if WR is 0 the input data reaches the latch input.
If WR is 1 the input of the latch looks like a wire connected to nothing.
The RD signal controls the output in a similar manner.
A Memory “Register”
If we take four of these latches and connect them together, we would have a 4-bit memory register
A group of memory registers
Expanding on this scheme to add more memory registers we get the diagram to the right.
A group of Memory Registers
If we represent each memory location (Register) as a block we get the following
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