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36
CDX-GT50W/GT500/GT500EE/GT550
• IC Pin Descriptions
IC3 MB90486BPFV-G-177E1 (CD SYSTEM CONTROL) (SERVO BOARD (2/2))
Pin No. Pin Name I/O Pin Description
1 CDON 1500MV O Servo 1.5 V power supply control signal output
2 to 5 NC — Not used. (Open)
6DRVON O Motor drive on/off control signal output
7 CD BUS0 I/O Bus data signal input/output 0
8 CD BUS1 I/O Bus data signal input/output 1
9 VSS — Ground pin
10 CD BUS2 I/O Bus data signal input/output 2
11 CD BUS3 I/O Bus data signal input/output 3
12 CD BUCK O Bus clock signal output
13 CD XCCE O Chip enable signal output
14 CD XRST O Reset signal output
15 CD ZDET I Zero detection signal input
16 to 20 NC — Not used. (Open)
21 VCC — Power supply pin (+3.3 V)
22 DAC ZDETL I Zero data detection signal input (L-ch)
23 DAC ZDETR I Zero data detection signal input (R-ch)
24 NC — Not used. (Open)
25 RXD I UART RXD data signal input (MCBUS/Flash data input)
26 TXD O UART TXD data signal output (MCBUS/Flash data output)
27 DEC SSTBY O SRAM STANDBY mode control signal output
28, 29 NC — Not used. (Open)
30 DEC INT I Request signal input
31, 32 NC — Not used. (Open)
33 AVCC — Power supply pin (+3.3 V) for A/D converter
34 AVRH — External reference voltage for A/D converter
35 AVSS — Ground pin
36 NC — Not used. (Open)
37 DEC XMUTE O Mute signal output L: mute
38, 39 NC — Not used. (Open)
40 VSS — Ground pin
41 NC — Not used. (Open)
42 MEC LIMIT I Sled limit in detection switch signal input
43 MEC LOAD O Loading motor signal output (Load direction)
44 MEC EJECT O Loading motor signal output (Eject direction)
45 MEC INSW I Pack-in detection signal input
46 MEC DSW I Chucking end detection switch signal input
47, 48 MD0, MD1 I CPU operation mode designation signal input (Connect to Vcc.)
49 MD2 I CPU operation mode designation signal input (Connect to Vss.)
50 BUS ON I Bus on signal input L: bus on
51 BU IN I Backup on/off signal input H: backup on, L: backup off
52 NC — Not used. (Open)
53 MEC SELFSW I Disc insert detection switch signal input L: disc in interruption
54, 55 NC — Not used. (Open)
56 UNISI I Serial data signal input
57 UNISO O Serial data signal output
58 UNICKI I Serial clock signal input
59 LINKOFF O Line off signal output
60 A ATT O Audio attenuation signal output H: ATT on
61 EJECT OK I Front panel open signal input H: eject
62 OPEN REQ O Front panel open/close request signal output H: open request
63 MECON O Mechanism deck power supply control signal output
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