Sony STR-DA90ESG, Service Manual

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DIGITAL BOARD IC3412 SSP424023FJ88 (DIGITAL SIGNAL PROCESSOR)
Pin No. Pin Name I/O Function
1 AGND —
Ground terminal (for address bus buffer)
2 MCS0 O
Chip select signal output to the external RAM device Not used (open)
3 MA15 O
4 MA14 O
Address signal output to the S-RAM (IC3411)
5 MA13 O
6 AVCC — Power supply terminal (+5V) (for address bus buffer)
7 MA12 O Address signal output to the S-RAM (IC3411)
8 AGND — Ground terminal (for address bus buffer)
9 QVCC —
Power supply terminal (+5V) (for internal logic)
10 QGND —
Ground terminal (for internal logic)
11 MA11 O
12 MA10 O
13 MA9 O
14 MA8 O
15 AGND —
Ground terminal (for address bus buffer)
16 MA7 O Address signal output to the S-RAM (IC3411)
17 AVCC — Power supply terminal (+5V) (for address bus buffer)
18 MA6 O
19 MA5 O Address signal output to the S-RAM (IC3411)
20 MA4 O
21 AGND —
Ground terminal (for address bus buffer)
22 MA3 O
23 MA2 O
24 MA1 O
25 MA0 O
26 SCK I
Serial data reading clock signal input from the master controller (IC3413)
27 EXTAL I
Master clock signal input terminal (3MHz)
28 QVCC — Power supply terminal (+5V) (for internal logic)
29 QGND — Ground terminal (for internal logic)
30 PINIT I Initialize input for the PLL circuit (fixed at “L”)
31 PGND —
Ground terminal (for PLL circuit)
32 PCAP I
Connected to the external capacitor for PLL circuit filter
33 PVCC —
Power supply terminal (+5V) (for PLL circuit)
34 SGND —
Ground terminal (for serial port)
35 MISO I
Communication data input from the master controller (IC3413)
36 RESET I
Reset signal input from the master controller (IC3413) “L”: reset
37 MODA I
Mode selection terminal (fixed at “H”)
38 MODB I
Mode selection terminal (fixed at “L”)
39 MODC I Mode selection terminal (fixed at “H”)
40 SVCC — Power supply terminal (+5V) (for serial port)
41 MOSI O Communication data output to the master controller (IC3413)
42 SS I SPI slave select signal input from the master controller (IC3413)
43 HREQ I
Host request signal input from the master controller (IC3413)
44 SGND —
Ground terminal (for serial port)
45 SDO2 O
Audio serial data output terminal (for rear side speaker)
Address signal output to the S-RAM (IC3411)
Address signal output to the S-RAM (IC3411)
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