Pioneer SX-SW77 Service Manual page 63

5
BR93L46RFJ-W (MAIN ASSY : IC5503)
• 64 × 16 bit EEPROM
Pin Arrangement (Top view)
CS 1
SK 2
DI 3
DO 4
Pin Function
No. Pin Name I/O
1 CS I
2 SK I
3 DI I
4 DO O
−
5 GND
−
6 NC
−
7 NC
−
8 VCC
5
6
8 VCC
7
NC
6 NC
5
GND
Pin Function
Chip select input
Serial clock input
Start bit, OP code, address and serial data inputs
Serial data output and READY/BUSY internal state display output
Ground
Non connection
Non connection
Power supply
6
7
Block Diagram
Instruction
1
CS
Decode
Control Clock
SK 2
Generation
Instruction Address
3
DI
Register Buffer
Register
Dummy Bit
DO 4
SX-SW77
7
8
Power Supply
Voltage Detection
Writing High Voltage
Prohibition Generation
6 bit
Address
Decoder
6 1,024 bit
bit EEPROM
16 bit
Data R/W
Amp.
16 bit
8
A
B
C
D
E
F
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