HP C2246 Technical Reference Manual page 59

Table A-1. Supported SCSl-2 Commands
Command Opcode
Use
Use
Description
(hex)
Before
When
Spin up
wp1
Enabled
Change 40 No No Requests the Target to change to the specified operating
Definition
definition. Supported definitions are SCSI (CCS) and SCSl-2.
Format Unit 04 No No Formats Target media into Initiator addressable logic blocks.
Defect sources include P, D, and G lists (no C list). When
formatting, it is recommended that the htltiator not include a D
list (FMTDAT=O}. However, if the htltiator does include a D
list, it must be in the physical sector or bytes from index format.
The Target uses an interleave of 1 regardless of the value in
Interleave field.
Inquiry
12
Yes Yes Requests that information regarding Target be sent to the
Initiator. Target returns 36 bytes of SCSI Standard Product
Data. Additional Vital Product Data (VPD) may be supplied if
requested by the Initiator.
Mode Select No
2
Yes
Provides a means for Initiator to specify media, logical unit, or
(6-byte)
15
drive parameters to Target. The following values are supported:
(10-byte) 55
• Media Type: 0
• Density Code: 0
• Number of Blocks: 0
• Block Length: 512, 1024, 2048
1
or 4096 bytes
• Page Codes (hex): 01, 02
1
03, 04, 08, 09, OA
Use of the following is supported:
• Disable Correction (DCR}
• Data Termination on Error {DTE)
• Post Error (PER)
• Transfer Block {TB)
• Retry Count
• Recovery Limit (converts to Retry Count)
Mode Sense No
2
Yes Provides a means for Target to report its media, logical unit, or
{6-byte)
IA
drive parameters to Initiator. The following CDB values are
(10-byte)
5A supported:
• Page Control Field: 00 (current values); 01 (changeable
values);
10
{default values); 11 {saved values)
• Page Codes (hex}: 01, 02, 03
1
04
1
08, 09, OA
The Target default block size is 512 bytes. Default page
parameters are listed in the MODE SENSE command
description.
Read No Yes Requests Target to transfer data to Initiator. Both 6-byte and
(6-byte} 08 10-byte (extended) command formats are supported.
(10-byte) 28
Read Buffer
3C
No
Yes Used with WRITE BUFFER command to test the Target's data
buffer. Recommend executing RESERVE command to guarantee
data integrity.
Notes:
1.
WP
=
Write Protect
2. Mode Select and Mode Sense commands that do not involve saved pages may be used before spinup.
SCSI Command Descriptions A-3