Samsung SGH-P400 Service Manual page 7

SG H- P400 Circuit Description
2 ) Co n n e c t o r
1 . L CD Co n n e c t o r
L CD i s c o n s i s t e d o f m a i n L CD (c o l o r 6 5 K T F D L C D ) . C h i p s e l e c t s i g n al s o f
E M I p a r t i n t h e t r i d e n t , C A M _C L CD _E N ,
c a n e n a b l e m ai n L C D . L E D _E N s i g n a l e n a b l e s w h i t e L E D o f m ai n L C D .
T h i s s i g n al i s f r o m I O p ar t o f t h e D S P i n t h e t r i d e n t . RST s i g n a l f r o m 2 1 0 6
i n i t i at e s t h e i n i t i a l p r o c e s s o f t h e L C D .
1 6 - b i t d at a l i n e s ( D (0 ) ~ D (1 5 )) t r a n s f e r s d a t a an d c o m m an d s t o L CD t h r o u g h
e m i _f i l t e r . D a t a an d c o m m an d s u s e A (2 ) s i g n a l . I f t h i s s i g n al i s h i g h , I n p u t s
t o L C D a r e c o m m a n d s . I f i t i s l o w , I n p u t s t o L CD a r e d at a . T h e s i g n al
w h i c h i n f o r m s t h e i n p u t o r o u t p u t s t a t e t o L CD , i s r e q u i r e d . B u t t h i s s y s t e m
i s n o t n e c e s s a r y t h i s s i g n a l . So CP _W E N s i g n a l i s u s e d t o w r i t e d at a o r
c o m m a n d s t o L C D .
P o w e r s i g n al s f o r L C D ar e V _b at an d V _c c d .
SP K 1 P a n d S P K 1 N f r o m CS P 1 0 9 3 a r e u s e d f o r a u d i o s p e ak e r . A n d V I B _E N
f r o m e n ab l e s t h e m o t o r .
2 . JT A G C o n n e c t o r
T r i d e n t h as t w o JT A G p o r t s w h i c h a r e f o r A RM c o r e an d D S P
c o r e ( D S P 1 6 0 0 0 ) . So t h i s s y s t e m h a s t w o p o r t c o n n e c t o r f o r t h e s e p o r t s .
P i n s ' i n i t i a l s f o r A RM c o r e ar e 'C P _' an d p i n s ' i n i t i al s f o r D SP c o r e a r e
'D S P _'.
C P _T D I a n d D S P _T D I s i g n a l ar e u s e d f o r i n p u t o f d at a . CP _T D O a n d
D S P _T D O s i g n al s a r e u s e d f o r t h e o u t p u t o f t h e d at a . CP _T C K an d
D S P _T C K s i g n a l s ar e u s e d f o r c l o c k b e c au s e JT A G c o m m u n i c at i o n i s a
s y n c h r o n o u s . C P _T M S an d D S P _T M S s i g n al s a r e t e s t m o d e s i g n a l s . T h e
d i f f e r e n c e b e t w e e n t h e s e i s t h e RE SE T _I N T s i g n a l w h i c h i s f o r A RM c o r e
RE S E T .
3 . I RD A
T h i s s y s t e m u s e s I RD A m o d u l e , H SD L _3 2 0 1 , H P 's . T h i s h a s s i g n a l s ,
I RD A _E N ( e n a b l e s i g n a l ) , I RD A _RX ( i n p u t d at a ) an d I RD A _T X ( o u t p u t d at a ).
T h e s e s i g n a l s ar e c o n n e c t e d t o P P I o f t r i d e n t . I t u s e s t w o p o w e r s i g n a l s .
V _c c d i s u s e d f o r c i r c u i t a n d V _b at i s u s e d f o r L E D .
3 ) I F c o n n e t o r
I t i s 1 8 - p i n c o n n e c t o r . T h e y a r e d e s i g n e d t o u s e SD S , D E B U G , D L C- D E T E CT ,
JI G _O N , V E X T , V T E S T , V F , C F , V B A T a n d GN D . T h e y c o n n e c t e d t o p o w e r
s u p p l y I C , m i c r o p r o c e s s o r an d s i g n a l p r o c e s s o r I C .
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