Samsung SGH-P408 Service Manual page 11

5 ) M e m o r y
T h i s s y s t e m u s e s SH A RP ' s
I t i s c o n s i s t e d o f 1 2 8 M b i t s f l as h m e m o r y an d 3 2 M b i t s p s u e d o SRA M . I t h as
1 6 b i t d a t a l i n e , D [ 0 ~ 1 5 ] w h i c h i s c o n n e c t e d t o t r i d e n t , L C D o r C SP 1 0 9 3 . I t
h as 2 2 b i t ad d r e s s l i n e s , A [ 1 ~ 2 2 ] . T h e y a r e c o n n e c t e d t o o . C P _C SRO M E N an d
C O_C SROM 2 E N s i g n a l s , c h i p s e l e c t s i g n a l s i n t h e t r i d e n t e n a b l e t w o m e m o r i e s .
T h e y u s e 3 v o l t s u p p l y v o l t ag e , V _c c d an d 1 .8 v o l t s u p p l y v o l t a g e , V c c _1 .8 a i n
t h e P SC 2 0 0 6 . D u r i n g w r t i n g p r o c e s s , C P _W E N i s l o w a n d i t e n a b l e s w r i t i n g
p r o c e s s t o f l as h m e m o r y a n d p s e u d o SRA M . D u r i n g r e ad i n g p r o c e s s , C P _OE N
i s l o w an d i t o u t p u t i n f o r m at i o n w h i c h i s l o c at e d at t h e a d d r e s s f r o m t h e
t r i d e n t i n t h e f l a s h m e m o r y o r SRA M t o d a t a l i n e s . E a c h c h i p s e l e c t s i g n al s i n
t h e t r i d e n t s e l e c t m e m o r y am o n g 2 f l a s h m e m o r y an d 2 SRA M . Re ad i n g o r
w r i t i n g p r o c e d u r e i s p r o c e s s e d af t e r C P _W E N o r C P _OE N i s e n a b l e d . M e m o r i e s
u s e F L A SH _RE SE T , w h i c h i s b u f f e r e d s i g n al o f RE SE T f r o m P SC 2 1 0 6 , f o r E SD
p r o t e c t i o n . A [ 0 ] s i g n al e n a b l e s l o w e r b y t e o f p s e u d o SRA M an d U P P E R_B Y T E
s i g n al e n ab l e s h i g h e r b y t e o f p s e u d o SRA M .
6 ) T r i d e n t
T r i d e n t i s c o n s i s t e d o f A RM c o r e a n d D SP c o r e . I t h as 2 0 K * 1 6 b i t s RA M
1 4 4 K * 1 6 b i t s RO M i n t h e D SP . I t h as 4 K * 3 2 b i t s ROM an d 2 K * 3 2 b i t s RA M i n t h e
A RM c o r e . D SP i s c o n s i s t e d o f t i m e r , o n e b i t i n p u t / o u t p u t u n i t ( B I O ) , JT A G , E M I
an d H D S( H ar d w a r e D e v e l o p m e n t Sy s t e m ) . A RM c o r e i s c o n s i s t e d o f E M I ,
P I C ( P r o g r am m ab l e I n t e r r u p t C o n t r o l l e r ) , r e s e t / p o w e r / c l o c k u n i t , D M A c o n t r o l l e r ,
T I C ( T e s t I n t e r f ac e C o n t r o l l e r ) , p e r i p h e r al b r i d g e , P P I , SSI ( Sy n c h r o n o u s Se r i a l
I n t e r f ac e ) , A C C ( A s y n c h r o n o u s c o m m u n i c a t i o n s c o n t r o l l e r s ) , t i m e r , A D C ,
RT C ( Re al - T i m e C l o c k ) a n d k e y b o a r d i n t e r f a c e .
D SP _A B [ 0 ~ 8 ] , ad d r e s s l i n e s o f D SP c o r e an d D SP _D B [ 0 ~ 1 5 ] , d at a l i n e s o f
D SP c o r e ar e c o n n e c t e d t o C SP 1 0 9 3 . A [ 0 ~ 2 0 ] , a d d r e s s l i n e s o f A RM c o r e an d
D [ 0 ~ 1 5 ] , d a t a l i n e s o f A RM c o r e a r e c o n n e c t e d t o m e m o r y , L C D an d Y M U 7 5 9 .
I C P ( I n t e r p r o c e s s o r C o m m u n i c at i o n P o r t ) c o n t r o l s t h e c o m m u n i c at i o n b e t w e e n
A RM c o r e an d D SP c o r e .
C SRO M E N , C SRA M E N an d C S1 N t o C S4 N i n t h e A RM c o r e ar e c o n n e c t e d t o
e ac h m e m o r y . W E N an d OE N c o n t r o l t h e p r o c e s s o f m e m o r y . E x t e r n al
I RQ ( I n t e r r u p t Re Qu e s t ) s i g n al s f r o m e a c h u n i t s , s u c h as , Y M U , E ar - j ac k ,
E ar - m i c an d C SP 1 0 9 3 , n e e d t h e c o m p at i b l e p r o c e s s .
So m e P P I p i n s h as m an y s p e c i al f u n c t i o n s . C P _K B [ 0 ~ 9 ] r e c e i v e t h e s t at u s
f r o m k e y F P C B an d ar e u s e d f o r t h e c o m m u n i c at i o s u s i n g
I RD A ( I RD A _RX / T X / E N ) an d d a t a l i n k
c ab l e ( D E B U G _D T R/ RT S/ T X D / RX D / C T S/ D SR) . A n d U P _C S/ SC L K / SD I , c o n t r o l
s i g n al s f o r P SC 2 0 0 6 ar e o u t p u t t e d t h r o u g h P P I p i n s . I t h as s i g n a l p o r t f o r
m e m o r y , L RS1 8 2 6 A .
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