Ks9274 (Ic601) : Cd-Mp3 Decoder - JVC MX-GA77 Service Manual

KS9274 (IC601) : CD-MP3 decoder

1.Block diagram
CD-ROM Decoder
20-22
DRAM CONTROLLER
2.Pin function
5 CLK
6 RESETB
10 FILTER_0
14 FILTER_1
15 PLL_BYPASS
20 CD_DATA
21 CD_LRCK
22 CD_BCK
24 ACLK
25 BCLK
26 LRCK
27 ADAT
35 MDAT
36 MCK
37 MLAT
38 MDOUT
39 MINT
44 DDAT0
45 DDAT1
46 WEB
47 RASB
50 DDAT2
51 DDAT3
52 CASB
53-62 DA9-DA0
63 OEB
KA3082 (IC401, IC402) : DC motor driver
1.Pin layout
LOGIC SWITCH
1 2 3 4
V
V
GND V Z1
CTL
O1
MP3 Decoder
44-63
1M 4bits DRAM
I System clock input
I System reset actibe LOW
O 820uF to GND940uF to GND
O When "HIGH" PLL is bypassed, Tied to LOW in normal operation
I
I
I
I
O
O
O
O
I Write/Read data from MCU to CD-MP3
I Data strobe signal from MCU
I Micom command identifier from MCU to CD-MP3
O Data from CD-MP3 to MCU
O Intertupt output to MCU
Data BUS
Data BUS
O Wtite enable
O Row address strobe
Data BUS
Data BUS
O Colume address strobe
O Address output
O Control output to make data output to "High-Z" at DRAM
DRIVER OUT
PRE DRIVER
TSD
5 6 7 8
PV
SV V
V V CC
CC
IN1 IN2
DAC
INTERFACE
HOST MCU INTERFACE
35-39
HOST MCU
2.Pin function
Pin No.
1
2
3
4
5
6
7
8
9
9 10
10
V
Z2 O2
24-27
Function
Symbol I/O
Ground
GND -
VO1 O Output 1
VZ1 Phase compensation
-
VCTL Motor speed control
I
VIN1 Input 1
I
VIN2 Input 2
I
SVCC Supply voltage (Signal)
-
Supply voltage (Power)
PVCC -
Phase compensation
VZ2 -
Output 2
VO2 O
MX-GA77
1-37