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6. Interface
(1) The interface is based on ANSI standard X3.131-1994 and X3T9.2/375R
(2) 42 commands are usable including CD-ROM unique commands
(3) The CD-ROM drive supports SCSI synchronous transfer and CD-DA data transfer
over SCSI function
(4) The 256 KByte data buffer handles both high and low speed data transmission
(5) The largest block size on playback is 2,647 Bytes (Including Error Flags)
The data length for each block is changeable by command
(6) On command execution, DISCONNECT processing and RECONNECT processing
can be specified
(7) Command Link functions are usable
6.1. Signal Lines
(1) Logical levels of every Inputs and Output are logically false signals
Input Low = 0.0 to +0.4 V=Logic '1' (true)
Input High = +2.5 V to +5.25 V=Logic '0' (false)
Output Low >/= 48 mA
Output High = Open collector (high impedance)
(2) The power supply line has a protection inside of the drive to protect the power supply.
This is shown in Figure 6
+5 V
6.1.1. Signal Line Termination
Figure 7 and Figure 8 shows the method for daisy chain connection and Figure 9 and
Figure 10 shows the method for radial connection.
Always connect the terminator for SCSI because of the open collector configuration
output drive.
Also be sure to attach the frame ground for grounding with the host system.
6.1.2. Receivers and Drivers
Figure 11 shows the construction and Figure 13 shows the interface pin assignments.
6.1.3. Connector
Figure 12 shows the details of connector and Figure 13 shows the interface pin assignments.
Protector
Diode
Figure 6 Power Supply Line
'POWER SUPPLY' header
12/27
SCSI Connector #26
XM-6401B Rev.1.0
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