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C I R C U I T D E S C R I P T I O N
o Input signal description (ex, CX23035)
1) Digiul audio data
T h i s L S I u s e s 1 6 - b i t s e r i a l d i g i t a l a u d i o d a t a ' a n d t h e
data bits are arranged from backward with respect
to
L R C K . A s t h e p e r i o d o f c l o c k B C K i s e q u a l t o t h e
d a t a
bit rate, more than 16 clocks are required for each word'
For example, when the signal processor LSI connected
i s C X 2 3 0 3 5 , w h i c h i s a C D s i g n a l p r o c e s s o r , L R C K i s
" H "
d u r i n g t h e L - c h a u d i o d a t a a n d
" L " d u r i n g t h e R - c h a u d i o
data, and the audio data is shifted in MSB-first mode
at
the fall of BCK. These Jactors can be set by the above-
mentioned selector Pins.
LRCK
DATA
B C K
3) Channel status data
By connecting D2 (pin 26) with the write frame
clock
o u t p u t t e r m i n a l ( w F c K ) o f t h e c D L S l , D 3
( p i n 2 5 ) w i t h
t h e s u b c o d e s y n c S 0 + 5 1 o u t p u t t e r m i n a l
( S C O R ) ' D 4
lpin 24\ with the subcode O output terminal
(SUBO) and
C R C K ( p i n 6 ) w i t h t h e s u b c o d e O e r r o r f l a g
t e r m i n a l
(CRCF), it becomes possible to read respectively the lD0'
i o t , C O p v l N H l B l T a n d E M P H A S I S i n f o r m a t i o n
f r o m
SUBO and to set them on the specified
positions of the
C-bit data. However, when there is no terminal correspond-
i n g t o c R C F , i t s h a l l b e f i x e d a | " H " '
2) Master clock
When a 1-sample/48-clock one-chip CD lC
(CX23035)
is used, a X'tal oscillator of 3 x 128Fs
= 16'9344MH2
shall be connected across XTAL (pin 13) and
EXTAL
(pin 14). The internal circuitray of this LSI lC uses the
1 / 3 c l o c k , w h i c h i s 5 . 6 M H z , a s t h e m a s t e r c l o c k ' w h i l e t h e
CD uses the output from 192Fs (pin 12) as the
master
clock (3 x 12BFsl2 = 8.4672MH21.
It is also possible to connect a 128Fs
(5'6448MH2)
X'tal oscillator across XTAL and EXTAL and to
use it
as the common master clock with the signal
processor
L S I .
F i g . 8 - 3
The category code (subcode bits 9 and 10) is
input in
D C v i a C g ( p i n 1 6 ) a n d C i O
( p i n 5 ) ' W i t h t h e C D ' t h e
category code is (C9, C10)
= (1' 0) so the bits are fixed
a t C 9 =
" H " a n d C 1 0 = " L " '
Note : D4 (SUBO) is read at the rise of
D2 (WFCK)'
latched and, when CRCF
= "H"' loaded as the C'bit
data at the fall of D3 (SCORI' lf CRCF
= "L" '
the Previous value is held'
With this LSl, it is also possible to input the
chanel
s t a t u s d a t a i n p a r a l l e l . I n t h i s c a s e ' l D O ' l D 1 ' C O P Y '
E M -
PHASIS and category code are input
respectively to D4'
D5, D6, D7 and C9 and C10 bv direct DC
inputs'
W F C K
EXCK
SBSO
1 8
SYNC. PATTERN
Fig. 8-4
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