Service Manual

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No.

1/0

Pin"

Name

Function

106

1!0

SCDI

SCPU data bus

107

-

vss

GND

108

SCD2

109

SCD3

110

SCD4

Ill

I/0

SCDS

SCPU data bus

1!2

SCD6

1!3

SCD7

1!4

SCD8

!IS

-

VDD

Power supply (SV)

116 SCD9

117

l/0

SCDIO

SCPU data bus

118

SCDll

119

-

vss

GND

120

SCD12

121

1/0

SCD13

SCPU data bus

122

SCD!4

123

SCDIS

124

-

vss

GND

125 I

MCCSN

Select signal from

MCPU

126 I MCCK

28 MHz clock from

MCPU

127

-

VDD Power supply (SV)

128

I/0

I

MCD7

MCPU data bus

• SCSP Chip Block Diagram

l SCPUI (SOUND CPU)

I

I

LFO

(LOW FREQ OSCILLATOR) I

ALFO PLFO

I MCPUI (MAIN CPU}

I

I

7f

I DMA

I

IPLFO

I

PG(PITCH GENERATOR)

I

:MIDI

I

I

ADP (ADDRESS POINTER)

I

l EXT(AUDIO INPUT)

I

7

I MEMCT

(MEMORY CONTROLLER)

I

6

+16

[EG

(ENVELOPE

GENERAT~~

I

liNTER

(INTEPOLA TOR}

_t_1o

t2o

l -lEG ALFOL PCM DATA I

MULTI (MULTIPLIER)

~

......

,

: sous

2o·············

r-

:

..

:-

..

:

..

::

..

:-------

;:

..

~-~

.-:

..

:,-

-;

..

:i:::-.:;-1

: EXTS :

: MIXS : :

MEMS:

.....

l

..

,

I

·····T····

.....

T

.....

J

I

I

I

"DSP"

......

! .... ,

~

L~~;~~.J

• .

..

J

...

,

: SEL :

-------------

-~---~--------

·····.:.r;···

I

16

I DIRECT EFFECT

OMIX (OUTPUT MIXER)

I

t

DAC

-54-

I

16

I

r

~

-

DRAM