:
1 ?
2 ?
3 , ?
(Static Random Access Memory SRAM) , - . ( ), .
² , . , -. , , (volatile memory). , , . . .
: - , , , . . , .
2 m × 1 , m , ², 2 m × n , n . SRAM, , (2 m × 8).
2 m × 4 . 5.3.
, , , . .
5.3
:
___
- CS (Chip Select) . 0 . ³ ;
___
- OE (Output Enable) . 0 ( ) . 1 z -;
____ _______ ________
- W/R (Write / Read) / . , .
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/ 0 
. ³ - .
, , 0 
. , .
, , 1. .
- ² .
SRAM 36 , 5 .
(Dynamic Random Access Memory DRAM) , - . , , .
² DRAM p-n- -, , . , 1, 0. (refresh) DRAM 2 4 . , . ² SRAM . ² 1 × 1, 4 × 1, 16 × 1, 64 × 1. DRAM .
, DRAM , , ² . , : 
(Column Address Strobe) 
(Row Address Strobe) .
² ( ) RAS ( 0), . ϳ , . ( ) . . . DI (Date Input). . 5.3.
ϳ ² , . 䳿 .
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5.3
DO (Date Output). . . 5.4.
 |
5.4
.
. . : , , //, ( , ). (hidden refresh), (transparent refresh) (cycle stealing).
² DRAM , . ² DRAM . , .
80386, i 486, Pentium SIMM (Single Inline Memory Modules ). SIMM : FPM (Fast Page Mode) 5 IBM PC 486 EDO (Extended Data Output ) 3,3 . 30 1 × 8, 1 × 9, 4 × 8 4 × 9. . SIMM 72 1 × 32, 1 × 36 ( ). 2 × 32, 4 × 32, 8 × 32, 16 × 32 .
DIMM DDR (Dual Inline Memory Modules Double Data Rate ), 64 M 1 . ' DIMM DDR, , , . DIMM DDR PC 1600, PC 2100, PC 2700 PC 3200 ( 1600, 2100, 2700 3200 / ).
RIMM RAMBUS, DIMM. RIMM 400/800 1,6/3,2 /.
:
1 ?
2 ?
3 ?
4 ?
5 ?
:
1 SIMM ?
2 ?
