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documentation:hardware:opera:cdrom

The CDROM drives used by the 3DO M1 use the Panasonic CD interface with some slight modifications. Also know as the MKE CD interface (MKE = Matsushita Kotobuki Electronics), MEI (Matsushita Electronics Interface), or SLCD interface. While the physical connector was similar to that of IDE on PCs these drives required specific interface cards (such as some Creative SoundBlaster cards.) The 3DO Blaster requires the use of a Panasonic CDROM due to it directly interfacing with the device as it would in the consoles.

Specifications

Disc Format CD-DA (red book audio)
CD-ROM Mode 1
CD-ROM Mode 2
CD-ROM Mode 2 XA Form 1
CD-ROM Mode 2 XA Form 2
CD-WO Regular
CD-WO Hybrid (CD-Bridge, PhotoCD)
Transfer Rate Audio 172.3KB/s, 344.4KB/s
Mode 1 150KB/s, 300KB/s
Mode 2 171.1KB/s, 342.KB/s
Mode 2 XA Form 1 150KB/s, 300KB/s
Mode 2 XA Form 2 170.2KB/s, 340.4KB/s
Burst Transfer Rate 4MB/s
Buffer Memory 32KB
Random Access Time Typically 350ms at double speed
Full Access Time Typically 750ms at double speed
Power +9V Typically 0.6A, Max 1.5A
+5V Typically 0.2A, Max 0.8A
Disc size 8cm, 12cm
LED access indicator
Switch open/close button on main board

Operation

From the technical guide:

[The] Expansion Bus driven by CLIO chip is connected to CD-ROM Interface Gate Array (called OSA). The OSA is used as CD-ROM drive interface and Expansion port buffer. Expansion port signals are almost the same signals with Expansion Bus, but CD-ROM drive signals are original. (See Expansion Bus Specification section of Appendix A.)

The STB- signal controls the timing of all information transfer between the 3DO IM System and the expansion devices. The 3DO IM System uses the STB- signal in conjunction with three control signals (SEL-, CMD-, and WR-) to control an expansion device. Eight possible Expansion Port transactions are possible with the encoding of the SEL-, CMD-, and WR- signals. The control signals are valid before, during, and after the assertion of the STB- signal. The control signals, however, are only guaranteed to be valid around the assertaion of the STB- signal as defined in the Electrical Caracteristics section of the document.

IDIN and IDOUT signals are used to determine each Expansion device's address during start up squence. At normal states, these signals stay High.

CD-ROM Interface Connector Pinout

From section 4-3-2 of the FZ-1 US technical guide:

PinNameComment
1 CDRST- RESET signal for CD-ROM drive
2 CDMDCHG Media Change Signal
3 GND
4 CDCMD- Data / Command-
5 GND
6 CDSTEN- Status Valid signal
7 GND
8 CDDTEN- Data Chunk Valid signal
9 GND
10 CDWAIT- Wait signal
11 GND
12 CDHRD- Read strobe
13 GND
14 CDHWR- Write strobe
15 GND
16 CDEN- Enable CD-ROM access
17 GND
18 CDD7 Data Bus 7
19 GND
20 CDD6 Data Bus 6
21 GND
22 CDD5 Data Bus 5
23 CDD4 Data Bus 4
24 GND
25 CDD3 Data Bus 3
26 CDD2 Data Bus 2
27 GND
28 CDD1 Data Bus 1
29 GND
30 CDD0 Data Bus 0

Commands

All commands sent to the CD-ROM drive are 7 bytes in length except the Abort Command. The operation code is the first byte of the command. All commands except the Reset Command return a Status Byte in the Status Return FIFO. The Status Byte describes the success or failure of the command. It is the last byte placed into the Status Return FIFO. All commands except the Read Sub Q Command and the Reset Command also return a Command Tag Byte in the Status Return FIFO. The Command Tag Byte is the first byte placed in the Status Return FIFO and corresponds to the Operation Code of the command.

Command Name Code Command Bytes in Data FIFO Bytes In Status FIFO Description
Seek (LBA) 01 01 00 LL BB AA 00 00 00 0 1 Seek to LL:BB:AA
Seek (MSF) 01 01 02 MM SS FF 00 00 00 0 1 Seek to MM:SS:FF
Spin up 02 02 00 00 00 00 00 00 0 1 Spins up disc
Spin down 03 03 00 00 00 00 00 00 0 1 Spins down disc
Diagnostics 04 04 0
Status? 05 05 1
Drawer Open / Eject 06 06 00 00 00 00 00 00 0 1
Drawer Close / Inject 07 07 00 00 00 00 00 00 0 1
Abort 08 08 0 1
Set mode 09 09 05 00 01 LL 02 RR 0 1 Set volume: LL = left volume, RR = right volume
09 03 00 SS SS 00 00 0 1 Set speed
Reset 0A 0A 00 00 00 00 00 00 0
Flush 0B 0B 0
Lock? 0C 0C LL 00 00 00 00 00 0 1 unlock: LL = 00
lock: LL = 01
Pause / resume? 0D 0D PP 00 00 00 00 00 1 pause: PP = 00
resume: PP = 80
Play MSF? 0E 0E mm ss ff MM SS FF 1 Play audio from mm:ss:ff to MM:SS:FF
Play track? 0F 0F tt ii TT II 00 00 1 Play audio from track and index tt:ii to TT:II
Read data 10 10 MM SS FF 00 NN NN Variable 1 Read N blocks from MM:SS:FF
10 LL BB AA 01 NN NN Variable 1 Read N block from 24bit LBA
Subchannel info? 11 11 00 00 00 00 00 00 1
Data path check 80 80 00 00 00 00 00 00 0 1 Status returned: 80 AA 55 XX

XX = status
Read Error 82 82 00 00 00 00 00 00 0 10
Read ID / Version 83 83 00 00 00 00 00 00 0 12 Get ID / version string

s[0x0] = 0x83
s[0x1] = manufacture ID (0x00)
s[0x2] = 0x10
s[0x3] = manufacture number (0x00)
s[0x4] = 0x01
s[0x5] = 0x00
s[0x6] = 0x00
s[0x7] = revision number (0x00)
s[0x8] = 0x00
s[0x9] = flag (0x00)
s[0xA] = 0x00
s[0xB] = device status
Mode Sense / Get Mode 84 84 05 00 00 00 00 00 0 7
Read Capacity 85 85 00 00 00 00 00 00 0 7
Read Header 86 86 00 00 00 00 00 00 0 6
Read Sub Q 87 87 00 00 00 00 00 00 0 12
Read UPC 88 88 00 00 00 00 00 00 0 10
Read ISRC 89 89 00 00 00 00 00 00 0 12
Read Disc Code 8A 8A 00 00 00 00 00 00 0 12
Read Disc Info 8B 8B 00 00 00 00 00 00 0 8
Read TOC 8C 8C 00 EE 00 00 00 00 0 10 Read the disc table of content entry EE
Read Session Info 8D 8D 00 00 00 00 00 00 0 8
Read Device Driver 8E 8E 00 00 00 00 00 00

Error Codes

CodeDescription
0x00 No error
0x01 Soft read error after retry
0x02 Soft read error after error correction
0x03 Not ready
0x04 Cannot read TOC
0x05 Hard read error
0x06 Seek failed to complete
0x07 Tracking servo failure
0x08 Drive RAM error
0x09 Self test failure
0x0A Focusing servo failure
0x0B Spindle servo failure
0x0C Data path failure
0x0D Illegal logical block address (LBA)
0x0E Illegal field in CDB
0x0F End of user encountered on track
0x10 Illegal data mode for track
0x11 Media changed
0x12 Power-on or reset occurred
0x13 Drive ROM failure
0x14 Illegal drive command
0x15 Disc removed during operation
0x16 Drive hardware error
0x17 Illegal request

Additional Information

Sources

documentation/hardware/opera/cdrom.txt · Last modified: 2022/10/02 19:41 (external edit)