Sony SCD-XB940, Service Manual

Page: 65 / 73

15
• MAIN BOARD IC607 CXD8791AQ (DIGITAL SERVO SIGNAL PROCESSOR)
Pin No. Pin Name I/O Description
1 HRD/HRXD I
Data read strobe signal input from the expander (IC612)
2 HWR/HFS I
Data write strobe signal input from the expander (IC612)
3 HCS I
Chip select signal input from the expander (IC612)
4, 5 HA1, HA0/HCK I
Address signal input from the system controller (IC605)
6 VDD —
Power supply terminal (+3.3V) (digital system)
7 to 9 PWM0 to PWM2 O
Sled motor control signal output to the sled motor drive (IC615)
10 VSS —
Ground terminal (digital system)
11, 12 EMU1, EMU0 I/O
Emulator signal input/output terminal Not used (open)
13 TDO O
Test data output terminal Not used (open)
14 TCK I
Test clock input terminal Not used (open)
15 TDI I
Test data input terminal Not used (open)
16 TMS I
Test mode select signal input terminal Not used (open)
17 TRST I
Test reset signal input terminal Not used (open)
18 VDD —
Power supply terminal (+3.3V) (digital system)
19 VSS —
Ground terminal (digital system)
20 TRREF I
Tracking reference signal input from the SSI33P3722 (IC001)
21 TRIN I
Mirror detect signal input from the SSI33P3722 (IC001)
22 FGREF I
FG reference clock signal input from the RF signal decoder (IC622)
23 FGIN I
FG signal input terminal
24 PGREF I
PG reference signal input terminal Not used (open)
25 PGIN I
PG signal input terminal Not used (open)
26 RS I
Reset signal input from the expander (IC612)
27 LG I
Not used (open)
28 DFCT1 I
Defect signal input terminal
29 HEAD I
Head signal input terminal Not used (open)
30 CLKODIS I
CLKOUT1 (pin
ea
) disable signal input terminal “H”: disable (fixed at “L” in this set)
31 CLKOUT1 O
Master clock output terminal Not used (open)
32 VDD —
Power supply terminal (+3.3V) (digital system)
33 VSS —
Ground terminal (digital system)
34 to 37 GIO15 to GIO12 —
Not used (open)
38 GIO11 O
Defect control signal output terminal
39 GIO10 O
Function control signal input from the expander (IC612)
40 GIO9 —
Not used (open)
41 GIO8 O
Clock signal output to the SSI33P3722 (IC001)
42 GIO7 O
Serial write data output to the SSI33P3722 (IC001)
43 GIO6/TMC2 I
Serial read data input from the SSI33P3722 (IC001)
44 GIO5/TMC1 O
Serial data enable output to the SSI33P3722 (IC001)
45 VDD —
Power supply terminal (+3.3V) (digital system)
46 GIO4/TMC0 I
Standby signal input from the tilt motor drive (IC614)
47 GIO3/INT5 —
Not used (open)
48 GIO2/INT4 O
Tilt motor control signal output to the tilt motor drive (IC614)
49 GIO1/INT3 O
Tilt motor control signal output to the tilt motor drive (IC614)
50 GIO0/INT2 I
Interrupt signal input terminal
51 VSS —
Ground terminal (digital system)
52 TESTC I
Test signal input terminal (fixed at “L”)