Intel 81342 Developer's Manual page 587

D D R S D R A M M e m o r y C o n t r o l l e r — I n t e l
E x a m p l e 1 5 . A d d r e s s R e g i s t e r P r o g r a m m i n g E x a m p l e 7
T h e u s e r w a n t s t o p r o g r a m t h e D D R r e g i s t e r s t o s u p p o r t t w o b a n k s a n d e a c h D D R b a n k
i s 2 G B y t e s , y i e l d i n g i n a t o t a l m e m o r y o f 4 G B y t e s ( 2 * 2 G B ) . T h e u s e r w a n t s t h e D D R
m e m o r y s p a c e t o s t a r t a t A 0 0 0 0 0 0 0 0 H . T h e u s e r w a n t s a 2 - G B y t e s e c o n d a r y w i n d o w
s t a r t i n g a t 0 0 0 0 0 0 0 0 0 H . N o t e t h a t t h e s e c o n d a r y m e m o r y w i n d o w o v e r l a p s t h e
p r i m a r y m e m o r y w i n d o w a n d s t a r t s a t t h e b o t t o m o f t h e p r i m a r y m e m o r y w i n d o w i n
t h i s e x a m p l e . T h e r e a r e n o 3 2 - b i t m e m o r y r e g i o n . T h e m e m o r y s p a c e s u m m a r y i s :
T h e r e g i s t e r s w o u l d b e p r o g r a m m e d a s f o l l o w s :
B a n k S i z e = 2 G B , S B S R [ 3 1 : 2 7 ] = 1 0 0 0 0
N u m b e r o f B a n k s = 2 , S B S R [ 2 ] = 0
S 3 2 S R [ 2 9 : 2 0 ] = 0 H , S 3 2 S R = 0 0 0 0 0 0 0 0 H
S D U B R = 0 0 0 0 0 0 0 A H , S D U B R [ 3 : 0 ] = 1 0 1 0
S D B R = 0 0 0 0 0 0 0 0 H , S D B R [ 3 1 : 2 8 ] = 0 0 0 0
S S D B R = 0 0 0 0 0 0 0 0 H
S e c o n d a r y B a n k S i z e = 2 G B , S B S R [ 2 1 : 1 6 ] = 1 0 0 0 0 0
D e c e m b e r 2 0 0 7
O r d e r N u m b e r : 3 1 5 0 3 7 - 0 0 2 U S
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8 1 3 4 1 a n d 8 1 3 4 2
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2
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I n t e l 8 1 3 4 1 a n d 8 1 3 4 2 I / O P r o c e s s o r s
D e v e l o p e r ' s M a n u a l
5 8 7