22.Memory

22.Memory - Memory organization 1 memory cell word line...

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1 Memory organization Memory organization memory cell word line bit-line Industry strives to make cells as small as possible. http://paradise.ucsd.edu/class/ece165/notes/lecC.pdf
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2 Memory Density Memory Density DRAM
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3 Flash memory cell Flash memory cell Enable word line. Inversion layer ? If YES, V BIT drops as C s is charged. READ this as ONE This is for NO charge on the floating gate. Why is S larger ?
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4 Charge on Floating Gate Charge on Floating Gate + + + + + + Q electron on FG Enable word line Is there an inversion layer? How does V T change? + ++ + -- + + + + V T no Q FG V T with Q FG ε top ox F top ox G T t Q t Q V , , = =
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5 Writing a 0 Writing a 0 Equilibrium Oxides too thick for direct tunneling Apply large WRITE voltage FAT now possible. Electrons trapped in FG well.
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6 Storing, Reading, Erasing a 0 Storing, Reading, Erasing a 0
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22.Memory - Memory organization 1 memory cell word line...

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