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DSP (Dlgltal Slgnal Processor: M8661131) PIN FUNCTION
Pin No.
Terminal
lr/Out
Function
'1,2, 4-9
DT7 - DTO
lrVOut
Data bus between exlernal RAM M865256
3
VDD
ln
+5V source
1 0
M M O D
ln
Extemal RAM selection terminal.
H i g h . . . . S t a t i c R A M
L o w . . . . . D y n a m i c R A M
Connecled to High level
1 1 . 1 2
CLKO, CLK1
lrVOut
16 MHz clock pulse inpuVoutput
1 3
RESET
l n
Power ON reset signal input. Low action
28
VDD
l n
+5V source
40
VSS
l n
Ground (0V) source
4 8 - 5 2
5 4 - 6 0
RV4 - RV8
RVg - RV15
Out
Digital sound data output. Sound waveform
from pin 66 is digitized in the built-in ADC and
output lrom these terminals.
65
VSS
l n
Ground (0V) source
66
C M P I
I n
Sound wavelorm input
67
BSHH
Out
KHz pulse for Sample/Hold Circuit
68
B I N H
Out
KHz sampling pulse for built-in ADC
70
CLKP
Out
I MHz (16 MHZJ2) clock pulse output.
As direct touch of oscilloscope probe on
oscillator may stop the oscillation, this terminal
is used for clock pulse checking.
7 2 - 7 5
RVTO - RVT3
In
Reverb time determination terminals.
Reverb time is determined by the vollage levels
of these terminals.
78
V D D 2
l n
+5V source
9 1 , 8 2
8 5 - 8 9
" 9 1 ' - 9 4
9 6 - 9 8
1 0 0
A D 1 4 , A D 1 2
AD7 - ADs
: ADgr^r ADg
ADz - AD1
ADO
Out
Address bus for the extemal RAM.
Stored data in RAM are read in various delay
tirhe'by vditng'H6l6fe$s
signals" ti&tiefio7'' ":'' '
,,83r,r89
MRAS, MMCS
- . : . ,
Out
- l
Extemal RAM chip:select signals
: j' ' ,.ii:
The RAM is selectbd when both,ot'lhese signals
arg LOw-19V91..,,a..,.
.r:1{.1 .'1;,-; ,1: ri.;'1,,.,,:
,..,. :'
84
WRIT
Out
wrra ai{{ur ii sid i'%i ;' {,r/hdif f bffi ,' Bifi ii€id'so u nd
data are written in RAM.
90
VSS
l n
Ground (0V source)
95
EOUT
Out
Output enable signal. When Low, the RAM
outbuts stored data.
I
R4q:'l=rr'-j:
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