Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E 103
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5.1.2
Group 1 Commands for all device types
The following commands are applicable for all device types, but the disc drive only implements those indi-
cated in the paragraphs following.
OP Code
Command Name
Section
39h
Compare Command
5.1.2.1
3Ah
Copy and Verify Command
5.1.2.2
3Bh
Write Buffer
5.1.2.3
3Ch
Read Buffer
5.1.2.4
5.1.2.1
Compare command (39h)
Not Implemented. A “Check Condition” Status is sent if received.
5.1.2.2
Copy and Verify command (3Ah)
Not Implemented. A “Check Condition” status is sent if received.
5.1.2.3
Write Data Buffer command (3Bh)
Table 5.1.2-1. Write Data Buffer Command
Bit
7
6
5
4
3
2
1
0
Byte(s)
0
0
0
1
1
1
0
1
1
Logical Unit No. [1]
RSVD
1
0
0
0
0
0
Mode [2]
2
Buffer ID
[5]
3
(MSB)
[6]
4
Buffer Offset
[6]
5
[6] (LSB)
6
(MSB)
7
Byte Transfer Length
[3]
8
(LSB)
9
0
0
0
0
0
0
Flag
Link
[4]
The Write Buffer command may be used in conjunction with the Read Buffer command as a diagnostic
function for testing the disc drive’s data buffer memory and the SCSI bus integrity. When used in a diagnostic
mode, the medium shall not be accessed during the execution of this command. Additional modes are pro-
vided for downloading and saving executable micro-code.
The function of this command and the meaning of the fields within the Command Descriptor Block depend on
the mode field (Byte 1, data bits 0, 1, 2).
