| Pin No | Pin name | Type | Pin function |
| 1 | VSs | P | Digital system ground (Vss) |
| 2 | RA4 | O | |
| 3 | RA5 | O |
| 4 | RA6 | O | CD-ROM encoder/decoder DRAM address lines |
| 5 | RA7 | O |
| 6 | RA8 | O |
| 7 | RA9 | O |
| 8 | VDD | P | Digital system power supply (5 V) |
| 9 | VSs | P | Digital system ground (Vss) |
| 10 | 100 | B | |
| 11 | 101 | B |
| 12 | 102 | B | CD-ROM encoder/decoder buffer RAM data lines |
| 13 | 103 | B | These pins have built-in pull-up resistors. |
| 14 | 104 | B |
| 15 | 105 | B |
| 16 | VDD | P | Digital system power supply (3.3 V) |
| 17 | VSs | P | Digital system ground (Vss) |
| 18 | 106 | B | |
| 19 | 107 | B |
| 20 | 108 | B | CD-ROM encoder/decoder buffer RAM data lines |
| 21 | 109 | B | These pins have built-in pull-up resistors. |
| 22 | 1010 | B |
| 23 | VSs | P | Digital system ground (Vss) |
| 24 | VDD | P | Digital system power supply (5 V) |
| 25 | 1011 | B | |
| 26 | 1012 | B |
| 27 | 1013 | B | CD-ROM encoder/decoder buffer RAM data lines |
| 28 | 1014 | B | These pins have built-in pull-up resistors. |
| 29 | 1015 | B |
| 30 | ATIPSYNC | O | ATIP SYNC detection signal |
| 31 | BIDATA | B | |
| 32 | BICLK | B | ATIP demodulator signals |
| 33 | WOBBLE | I |
| 34 | VDD | P | Digital system power supply (5 V) |
| 35 | VSs | P | Digital system ground (Vss) |
| 36 | ACRCNG | O | ATIP CRC result output signal |
| 37 | WRITE | I | Write strategy signal control input |
| 38 | SSP2 | O | Servo sampling pulse output |
| 39 | SSP1 | O | Servo sampling pulse output |
| 40 | RAPC | O | Laser control sampling pulse output |
| 41 | WAPC | O | Laser control sampling pulse output |
| 42 | H11TO | O | Running OPC sampling pulse |
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