- :
= + x
-: , , - . . 7.3 , -. , , .
- - | ||
+ | -0 | |
+ | -1 | |
- | + | |
+ | ||
+ | 2 | |
+ | 3 - | |
+ | 0 | |
+ 1 | ||
++1 + 1 | ||
+ | ||
+ | ||
+ 2 | ||
- | +0 | |
- | +2 | |
+1 |
. 7.3. -
. - /, . : . -, /. - -, -.
: (access time) (cycle time). . .
|
|
( ). () . () , .
. , , . : RAS - row-access strobe ( ), , CAS - column-access stobe ( ), . , , .
. , , . 8 .
, , . , , 5% . .
, . , , 4 - 8 , 8 - 16 . , 1975 , ( - ). , , Cray Research .
. , 60% . ( 7% ). 1987 50% . . 7.4 .
|
|
RAS | CAS - | ||
max | min | ||
1980 1983 1986 1989 1992 1995? | 64 256 1 4 16 64 | 180 150 120 100 80 65 | 150 120 100 80 60 45 75 50 25 20 15 10 250 220 190 165 120 100 150 100 50 40 30 20 |
. 7.4. ( )
, . - - . , .
- , . - .
: "" , , , , .