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1、The work principle of the Memory1. The structure of the MemoryThe Memory is used to deposit the data. It is to make use of high and low even electricity to deposit the data, and that is to say, its depositing data is an electricity even and high and low, not the 1234 such as arithmetic figure, then,
2、 our riddle undone. So computer is not mysterious too.A Memory looks like some small drawers, there are eight small blanks in a small drawer, every small blank is used to deposit the electric charge, the electric charge spreads to come in or release passing the electric wire that connect with each o
3、ther, as to the electric charge how to place in the small blank, we need not worried. You can think the electric wire as water pipe. The electric charge in the blank is water. That is easy to comprehend. The small drawer in saving each one in the machine is a place that puts the data, we call it as
4、a Unit.We can start depositing the data. If you want to put into a figure 12, that is 00001100, we as long as save No.2 and No.3 small blank in full electric charge, but other small electric charge in the blank to release. But the problem comes out, Memory contain a lot of units, the line is to para
5、llel. When you put the electric into a blank, you will put the electric charge into all units, and when you release the electric charge, you will put all electric charge in every unit. So how many units the Memory have, you can put the same piece, this of course is not what we hope, therefore, we ne
6、ed make some varieties on the construction slightly. Every unit has a control line, I want to put the data into which unit, the control line that give a signal in this unit. This control line open the switch, like this, electric charge can then flux free, and the other unit control lines have no the
7、 signal, so the switch do not open, cant suffer from the influence, like this, the control line that only control the different unit, can write in to each unit the different data. The same as, if want to take the data in a certain unit, and also as long as open the homogeneous control the switch lin
8、e.2. The Memory translates the codeHow we come to control the every unit controlling line? A control for returning remarkably, each unit dollar line leads the outside of the integrated circuit not line? Affair can dont be so simple, one 27512 have 65536 units in Memory, have each line the derivation
9、 to, this integrated circuit must more than 60,000 feet? Not line, how do? Wanting the viewpoint reduces the linear quantity.We have a kind of method to call this as to translate the code, the simple introduction is once: Can a line represent 2 kinds of appearances, can 2 lines represent 4 kinds of
10、appearances, can 3 lines represent how many kinds, 256 kinds of appearances need again how many lines represent? 8 kinds? 8 lines? So we need 16 lines to represent 65536 kinds of appearances.3. The Memorys enable chip and the concept of the busTo this, translate the problem of the code resolved, let
11、 us come again to pay attention to another problem. Sending into eight lines of each unit is to use from where of? It is from the calculation on board to connect to come over, generally, these eight lines besides connecting the Memory, still connect other machine piece, Like this problem come out, t
12、hese eight lines is not a Memory and a computer appropriatly, if always a certain unit connecting here eight on-line, not well, for example this saving machine number in the unit is first 0FFH, another saving machine is 00H, so this line after all is to be placed in the high electricity even, still
13、low electricity even? Who will be harmful? So we want to let them separate. The way is easy certainly, the line that be the outside receives the integrated circuit leads the feet after coming in, dont receive directly each unit go to, adding one more set of switch in the center line. Usually we step
14、 aside the pass opens, if faces really this is saving to write in the data in the machine, or want to read a data from the Memory, then step aside the pass connect the line. This switch from three fuses choice: Reading the control carry, writes the control carries to choose to carry with the slice.
15、Want to write in the data into a slice of inside, pick out first that chip, then send out to write a letter the number, switch match the top, combining will spread to come over of the data (electric charge) writes in an inside. If read, pick out first that slice of, then send out to read the letter
16、the number, the switch matches the top, data was sent out to go to. Read different from writing a letter the number to still connect to the another to save the machine at the same time, but because the slice chooses differently, although read or write a letter the number, have no the chip enable signal, so another Memory cant misunderstand open the door, result in the clash. So would the different hour pick out two chips? As long as is to design the system cant, do
