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CDU-541 CD-ROM DRIVE SCSI INTERFACE MANUAL
that initiator.
The additional sense code will be set to the appropriate
value.
If an STOP UNIT command (with LoEj set) is received from an initiator with a
'-_---
pending unit attention condition the controller will perform the command and
will not clear the unit attention condition.
If an initiator issues a command other than INQUIRY, REQUEST SENSE, or STOP
UNIT (with LoEj set) while a unit attention condition exists for that
initiator, the controller will terminate the command with a CHECK CONDITION
status.
4.1.4. Ready Condition/Not Ready Condition
The ready condition occurs after a caddy is inserted and the table of
contents has been recovered from the disc.
A not
1)
2)
3)
4)
ready condition occurs for the following reasons:
There is no caddy inserted.
The drive is unable to load or unload the caddy.
The drive is unable to recover the table of contents.
The controller cannot select drive.
(This can only occur
controller was previously able to select the drive).
if the
A check condition status will be returned for the drive not ready condition
only for commands that require or imply a disc access.
The following commands
will not return a check condition status for the not ready condition.
The
value in parentatheses is the command code.
1)
INQUIRY (12h)
6)
STOP UNIT with LoEj bit set to one (lBh)
2)
MODE SELECT (15h)
7)
ALLOW MEDIUM REMOVAL (lEh)
3)
RESERVE (16h)
8)
READ BUFFER
(3Ch)
4)
RELEASE (17h)
9)
WRITE BUFFER ( 3Bh)
5)
MODE SENSE (lA)
The following commands will return a check condition status for the not
ready condition.
The value in parentatheses is the command code.
1 ) TEST UNIT READY ( OOh )
lS) READ HEADER (44h)
2)
REZERO UNIT (Olh)
16) PLAY AUDIO (10){4Sh)
3)
READ (08h)
17) PLAY AUDIO MSF (47h)
4)
SEEK (OBh)
18) PLAY AUDIO TRACK/INDEX (48h)
5)
START UNIT with Start bit set (lBh)
19) PAUSE/RESUME (4Bh)
6)
RECEIVE DIAGNOSTIC RESULTS (lCh)
20)
READ
TOC (C1h)
7)
SEND DIAGNOSTIC (lDh)
21) READ SUB-CHANNEL (C2h)
8)
PREVENT MEDIUM REMOVAL (lEh)
22)
READ
HEADER (C3h)
9)
READ CAPACITY (2Sh)
23) PLAYBACK STATUS (C4h)
10) READ EXTENDED (28h)
24) PAUSE (CSh)
11)
SEEK EXTENDED ( 2Bh)
25) PLAY TRACK (C6h)
12) VERIFY (2Fh)
26) PLAY MSF (C7h)
13) READ SUB-CHANNEL (42h)
27) PLAY AUDIO (C8h)
14) READ TOC (43h)
28) PLAYBACK CONTROL (C9h)
4-2
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