Samsung SC-148B Service Manual page 9

PIN DESCRIPTIONS
NO ORIGIN NAME
1 /PM /CE
2 /DM /UCS
3 /RD7 /URD
4 /WR /UWR
5 VLD VLD
6 P5.1/AS N.C.
7 P5.0/ N.C.
8 P4.7/CS3 /XCE
9 P4.6/CS2 /XCM
10 P4.5/CS1 /XRD
11 P4.4/CS0 /XWR
12 VDD1 VDD
13 VSS1 VSS
14 Xout Xout
15 Xin Xin
16 VPP/EA EA
17 P4.3 BUS3
18 P4.2 BUS2
19 /RESET /RESET
20 P4.1 BUS1
21 P4.0 BUS0
22 PWM1 PWM1
23 PWM0 PWM0
24 P3.5 CENT
25 P3.4 CENT
26 P3.3 SPM_FG
27 P3.2 SPIN_CTL
28 P3.1 /OPEN
29 P3.0 /CLOSE
30 P2.7/INT7 RF_CON
31 P2.6/INT6 N.C.
32 P2.5/INT5 /SCOR
33 P2.4/INT4 TR_OUT
34 P2.3/INT3 TR_IN
35 P2.2/INT2 D_INT
36 P2.1/INT1 FLGC
37 P2.0/INT0 FLGA
38 P1.7 MON
39 P1.6 SPM_DIR
40 P1.5 AMUTE
I/O FUNCTION
O EXT PROM CHIP ENABLE
O INTERFACE CHIP SELECT
O INTERFACE CHIP READ
O INTERFACE CHIP WRITE
I VOLTAGE LEVEL DETECT
O N.C
O N.C
O DSP CHIP SELECT
O DSP FIRST COMMAND
O DSP READ
I/O DSP WRITE
I VCC
I GND
O CRYSTAL OUTPUT
I CRYSTAL INPUT
I ADDRESSING MODE SELECT
I/O DSP COMMAND BUS3
I/O DSP COMMAND BUS2
I MICOM RESET
I/O DSP COMMAND BUS1
I/O DSP COMMAND BUS0
O PWM CONTROL
O PWM CONTROL
O DRIVE IC RESET
O CENTER SERVO CONTROL
I SPINDLE MOTOR CONTROL
O CPINDLE BRAKE CONTROL
I OPEN LIMIT SWITCH
I CLOSE LIMIT SWITCH
O PLL CONTROL
I/O N.C
I DSP SYNC INTERRUPT
O TRAY OPEN CONTROL
O TRAY CLOSE CONTROL
I ROM DECODER INTERRUPT
I FOCUS O.K.
I TRACKING EPROR ZERO
O SPINDLE MOTOR ON/OFF
I N.C
O AUDIO MUTE CONTROL
NO ORIGIN NAME
41 P1.4 MT1
42 P1.3 MT2
43 P1.2 MT3
44 P1.2 TRO_SW
45 P1.0 STEP_P1
46 P0.7/ADC3 0.5Vref
47 R0.6/ADC2 FMO
48 P0.5/ADC1 /EJECT
49 P0.4/ADC0 /PLAY
50 AVREF AVREF
51 P0.3 SLEEP_SW
52 VSS2 VSS2
53 VDD2 VDD2
54 P0.2 EMPHA
55 P0.1 /XRST
56 P0.0 LED_BUSY
57 D0 D0
58 D1 D1
59 D2 D2
60 D3 D3
61 D4 D4
62 D5 D5
63 D6 D6
64 D7 D7
65 A0 A0
66 A1 A1
67 A2 A2
68 A3 A3
69 A4 A4
70 A5 A5
71 A6 A6
72 A7 A7
73 A8 A8
74 A9 A9
75 A10 A10
76 A11 A11
77 A12 A12
78 A13 A13
79 A14 A14
80 A15 A15
33
I/O FUNCTION
I PRODUCT TEST PINO
I PRODUCT TEST PIN1
I PRODUCT TEST PIN2
O TRO CONTROL SWITCH
O STEP MOTOR ENABLE
O RESET CONTROL
I FMO
I EJECT BUTTON
I N.C
I ADC REFERENCE VOLTAGE
O SELLP MODE CONTROL
I VSS2
I VDD2
O AUDIO EMPHASIS CONTROL
O OUTPUT DEVICE RESET
O LED BUSY CONTROL
I EXT PROM DATA0
I EXT PROM DATA1
I EXT PROM DATA2
I EXT PROM DATA3
I EXT PROM DATA4
I EXT PROM DATA5
I EXT PROM DATA6
I EXT PROM DATA7
O EXT PROM ADDRESS 0
O EXT PROM ADDRESS 1
O EXT PROM ADDRESS 2
O EXT PROM ADDRESS 3
O EXT PROM ADDRESS 4
O EXT PROM ADDRESS 5
O EXT PROM ADDRESS 6
O EXT PROM ADDRESS 7
O EXT PROM ADDRESS 8
O EXT PROM ADDRESS 9
O EXT PROM ADDRESS 10
O EXT PROM ADDRESS 11
O EXT PROM ADDRESS 12
O EXT PROM ADDRESS 13
O EXT PROM ADDRESS 14
O EXT PROM ADDRESS 15