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Samsung SGH-P408 Service Manual page 12

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SG H- P408 Circuit Description
c h a r g i n g ( C H G _D E T , C H G _ST A T 0 ) , SI M _RE SE T an d F L I P _SN S w i t h w h i c h w e
k n o w s o p e n .c l o s e d s t a t u s o f f o l d e r . I t h as JT A G c o n t r o l p i n s ( T D I / T D O / T C K ) f o r
A RM c o r e an d D SP c o r e . I t r e c i e v e s 1 3 M H z c l o c k i n C K I p i n f r o m e x t e r n al
T C X O an d r e c e i v e s 3 2 .7 6 8 K H z c l o c k f r o m X 1 RT C . A D C ( A n a l o g t o D i g i t al
C o n v e r t o r ) p ar t r e c e i v e s t h e s t at u s o f t e m p e r a t u r e , b at t e r y t y p e a n d b at t e r y
v o l t ag e . A n d c o n t r o l s i g n al s ( D SP _I N T , D SP _I O a n d D SP _RW N ) f o r D SP c o r e ar e
u s e d . I t e n ab l e s m ai n L C D a n d s m al l L C D w i t h D SP I P p i n s .
7 ) C SP 1 0 9 3
C SP 1 0 9 3 i n t e g r at e s t h e t i m i n g an d c o n t r o l f u n c t i o n s f o r G SM 2 + m o b i l e
ap p l i c at i o n w i t h t h e A D C an d D A C f u n c t i o n s . T h e C SP 1 0 9 3 i n t e r f ac e s t o t h e
t r i d e n t , v i a a 1 6 - b i t p ar a l l e l i n t e r f ac e . I t s e r v e s as t h e i n t e r f ac e t h a t c o n n e c t s
a D SP t o t h e RF c i r c u i t r y i n a G SM 2 + m o b i l e t e l e p h o n e . D SP c an l o ad 1 4 8
b i t s o f b u r s t d at a i n t o C SP 1 0 9 3 ¡¯ s i n t e r n al r e g i s t e r , an d p r o g r am C SP 1 0 9 3 ¡¯ s
e v e n t t i m i n g an d c o n t r o l r e g i s t e r w i t h t h e e x ac t t i m e t o s e n d t h e b u r s t . W h e n
t h e t i m i n g p o r t i o n o f t h e e v e n t t i m i n g an d c o n t r o l r e g i s t e r m at c h e s t h e i n t e r n al
q u ar t e r - b i t c o u n t e r an d i n t e r n al f r am e c o u n t e r , t h e 1 4 8 b i t s i n t h e i n t e r n a l
r e g i s t e r ar e G M SK m o d u l at e d ac c o r d i n g t o G SM 2 + s t an d ar d s . T h e r e s u l t i n g
p h as e i n f o r m at i o n i s t r an s l at e d i n t o I an d Q d i f f e r e n t i al o u t p u t v o l t ag e s t h at c an
b e c o n n e c t e d d i r e c t l y t o a n RF m o d u l at o r at t h e T X O P a n d T X O N p i n s . T h e
D SP i s n o t i f i e d w h e n t h e t r an s m i s s i o n i s c o m p l e t e d . F o r r e c e i v i n g b as e b an d
d at a, a D SP c an p r o g r am C SP 1 0 9 3 ¡¯ s e v e n t t i m i n g a n d c o n t r o l r e g i s t e r w i t h t h e
e x ac t t i m e t o s t ar t r e c e i v i n g I an d Q s am p l e s t h r o u g h T X I P an d T X I N p i n s .
W h e n t h at t i m e i s r e a c h e d , t h e c o n t r o l p o r t i o n o f t h e e v e n t t i m i n g an d c o n t r o l
r e g i s t e r w i l l s t ar t t h e b as e b a n d r e c e i v e s e c t i o n c o n v e r t i n g I an d Q s am p l e
p ai r s . T h e s am p l e s ar e s t o r e d i n a d o u b l e - b u f f e r e d r e g i s t e r u n t i l t h e r e g i s t e r
c o n t ai n s 3 2 s a m p l e p ai r s . C SP 1 0 9 3 t h e n n o t i f i e s t h e D SP w h i c h h as a m p l e t i m e
t o r e ad t h e i n f o r m at i o n o u t b e f o r e t h e n e x t 3 2 s am p l e p a i r s ar e s t o r e d . T h e
v o i c e b an d A D C c o n v e r t e r i s s u e s an i n t e r r u p t t o t h e D SP w h e n e v e r i t f i n i s h e s
c o n v e r t i n g a 1 6 - b i t P C M w o r d . T h e D SP t h e n r e a d s t h e n e w i n p u t s am p l e an d
s i m u l t an e o u s l y l o ad s t h e v o i c e b an d o u t p u t D A C c o n v e r t e r w i t h a n e w P C M
o u t p u t w o r d . T h e v o i c e b a n d o u t p u t c an b e c o n n e c t e d d i r e c t l y t o a s p e a k e r v i a
A O U T A N an d A O U T A P p i n s an d b e c o n n e c t e d t o a E ar - m i c s p e ak e r v i a
A O U T B N an d A OU T B P p i n s .
8 ) X - T A L ( 1 3 M H z )
T h i s s y s t e m u s e s t h e 1 3 M H z T C X O , T C O - 9 1 4 1 B , T o y o c o m . A F C c o n t r o l s i g n al
f o r m C SP 1 0 9 3 c o n t r o l s f r e q u e n c y f r o m 1 3 M H z x - t al . I t g e n e r at e s t h e c l o c k
f r e q u e n c y . T h i s c l o c k i s f e d t o C SP 1 0 9 3 ,T r i d e n t ,Y M U 7 5 9 an d Si l ab s o l u t i o n .
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
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