Sony MZ-R50 - MD Walkman MiniDisc Recorder - 6 Diagrams; Explanation of IC Terminals

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Pin No. Pin name I/O Description
1 MNT 0 O Traverse count signal output.
2 MNT 1 O Track jump detect output.
3 MNT 2 – Not used (Open).
4 MNT 3 – Not used (Open).
5 SWDT I Inputs write data signal from system controller (IC801).
6 SCLK I Inputs serial clock signal from system controller (IC801).
7 XLAT I Inputs serial latch signal from system controller (IC801).
8 SRDT O Outputs write data signal to system controller (IC801).
9 SENS O Outputs internal status (SENSE) to system controller (IC801).
10 XRST I Inputs reset signal from system controller (IC801). Reset : L
11 SQSY O
Output subcode Q sync (SCOR) to system controller (IC801).
Outputs “L” every 13.3msec. Outputs “H” at all most mostly.
12 DQSY O
Outputs digital-in U-bit CD format subcode Q sync (SCOR) to system controller (IC801).
Outputs “L” every 13.3msec. Outputs “H” at all most mostly.
13 WRPWR I Inputs laser power switching signal from system controller (IC801).
14 NC – Not used (Open).
15 TX I
Input of write data taransmission timing from system controller (IC801).
Also used as magnetic field head ON/OFF output.
16 OSC1 O Clock output (22.5MHz).
17 OSC0 I Clock input (22.5MHz).
18 XTSL – Not used (Fixed at “L”)
19 NC – Not used (Ground).
20 RVSS – Connect to ground.
21 DIN I Digital audio signal input pin (For optical input).
22 NC – Not used (Open).
23 ADDT I Audio data input from A/D converter (IC303).
24 DATA O Monitor/decode audio data output to A/D converter (IC303).
25 ALRCK O L/R clock output to D/A converter (IC303).
26 ABCK O Bit clock signal output to A/D, D/A converter (IC303).
27 FS256 O 11.2896MHz clock output (MCLK).
28 DVDD – Power supply (+2.8V) for digital.
29 – 39 A00 – A08, A10, A11 O Address signal output to RAM (IC509).
40 DVSS – Ground terminal.
41 XOE O Output enable contol signal output to RAM (IC509).
42 XCAS O Column address strobe singal output to RAM (IC509).
43 A09 O Address signal output to RAM (IC509).
44 XRAS O Row address strobe signal output to RAM (IC509).
45 XWE O Read/write control signal output to RAM (IC509).
46 – 49 D0 – D3 I Data signal input from RAM (IC509).
50 MVCI – Not used (Connect to ground).
51 ASYO O Playback EFM full-swing output (L : VSS, H : VDD).
52 ASYI I Playback EFM asymmetry comparate voltage input.
53 AVDD – Power supply (+2.8V) for analog.
54 BIAS I Playback EFM asymmetry circuit constant current input.
55 RFI I Inputs playback EFM RF signal from RF amplifier (IC501).
SECTION 6
DIAGRAMS
6-1. EXPLANATION OF IC TERMINALS
IC503 DIGITAL SERVO, ATRAC (CXD2652AR)