Samsung SGH-X430 Service Manual page 10

2 . S G H - X 4 3 0 C i r c u i t D e s c r i p t i o n
Since the play data of YMU762MA3 are inte rpre te d at anytime through FIFO,
the le ngth of the data(playing pe riod) is not limite d, s o the de vice can
fle xiblys upport applic ation s uc h as incoming c all me lody mus ic dis tribution
s e rvice . The hardware s e que nce r built in this de vic e allows playing of the
comple x mus ic without giving e x ce s s ive load to the CPU of the portable
te le phone s . More ove r, the re gis te rs of the FM s ynthe s ize r can be ope rate d
dire ctly for re al time s ound ge ne ration, allowing, for e xample , utilization of
various s ound e ffe cts whe n us ing the game s oftware ins talle d in the portable
te le phone .
YMU76 2 include s a s pe ake r amplifie r with high ripple re moval rate whos e
max imum output is 550mW (SPVDD=3.6V). The de vic e is als o e quippe d with
conve ntional function including a vibartor and a circuit for c ontrolling LEDs
s ynchornous with mus ic.
For the he adphone , it is provide d with a s te re ophonic output te rminal.
For the purpos e of e nabling YMU762MA3 to de mons tarte its full capablitie s ,
Yamaha purpos e to us e "SMAF:Synthe tic mus ic Mobile Application Format" as a
data dis tribution format that is compatible wiht multime dia. Since the SMAF
take s a s tructure that s e ts importance on the s ync hronization be twe e n s ound
and image s , various conte nts can be writte n into it including incoming call
me lody with words that can be us e d for traning karaoke , and comme rcial
channe l that combine s te xts , image s and s ounds , and othe rs . The hardware
s e que nce r of YMU762MA3 dire c tly inte rpre ts and plays bloc ks re le vant to
s ys the s is (playing mus ic and re producing ADPCM with FM s ynthe s ize r) that are
include d in data dis tribute d in SMAF.
5) Me mory
This s ys te m us e s SHARP's me mory, LRS1828.
It is cons is te d of 128M bits flas h me mory and 32M bits SCRAM. It has 16 bit
data line , D[ 0~ 15] which is conne cte d to tride nt, LCD or CSP1093. It has 22
bit addre s s line s , A[ 1~ 22] . The y are conne cte d too. CP_CSROMEN and
CO_CSROM2EN s ignals , chip s e le ct s ignals in the tride nt e nable two me morie s .
The y us e 3 volt s upply voltage , VCCD.
During wrting proce s s , CP_WEN is low and it e nable s writing proce s s to flas h
me mory and SCRAM. During re ading proc e s s , CP_OEN is low and it output
information which is locate d at the addre s s from the tride nt in the flas h
me mory or SCRAM to data line s . Each chip s e le ct s ignals in the tride nt s e le ct
me mory among 2 flas h me mory and SCRAM. Re ading or writing proc e dure is
proce s s e d afte r CP_WEN or CP_OEN is e nable d. Me morie s us e FLASH_RESET,
which is buffe re d s ignal of RESET from PSC2106, for ESD prote ction. A[ 0]
s ignal e nable s lowe r byte of SCRAM and UPPER_BYTE s ignal e nable s highe r
byte of SCRAM.
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