$A m a i n m e m o r y u n i t w i t h a c a p a c i t y o f 4$ $m e g a b y t e s i s b u i l t u s i n g 1 M \times 1 - b i t D R A M$
$c h i p s . E a c h D R A M c h i p h a s 1 K r o w s o f$
$c e l l s w i t h 1 K c e l l s i n e a c h r o w . T h e t i m e$
$t a k e n f o r a s i n g l e r e f r e s h o p e r a t i o n i s 100$ $n a n o s e c o n d s . T h e t i m e r e q u i r e d t o p e r f o r m$
$o n e r e f r e s h o p e r a t i o n o n a l l t h e c e l l s i n$
$t h e m e m o r y u n i t i s$

3200 * 2^{20} n a n o s e c o n d s

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100 * 2^{10} n a n o s e c o n d s

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100 n a n o s e c o n d s

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100 * 2^{20} n a n o s e c o n d s

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Solution

The correct option is A $3200 * 2^{20} n a n o s e c o n d s$
$M a i n m e m o r y u n i t h a s c a p a c i t y = 4 M B$

$N o . o f D R A M c h i p s = \frac{4 M B}{1 M \times 1 b i t}$

$= \frac{4 M \times 8 b i t}{1 M \times 1 b i t}$

$= 32$

$1 D R A M c h i p h a s 1 K (20^{10}) R o w s a n d$
$1 K (2^{10}) c e l l s$

$I n e a c h r o w = 32 \times 2^{10}$

$T i m e t a k e n i n o n e r e f r e s h o p e r a t i o n$
$= 100 n s$

$T i m e r e q u i r e d t o p e r f o r m o n e r e f r e s h$
$o p e r a t i o n o n a l l t h e c e l l s i n M M u n i t$

$= 32 \times 2^{10} \times 100 n s$
$= 3200 \times 2^{10} n s$

$O p t i o n i s n o t m a t c h i n g w i t h a b o v e a n s w e r .$

$S o t a k e t h e s e r i a l r e f r e s h c e l l w i s e i . e .,$
$32 \times 2^{20} \times 100$

Suggest Corrections

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