SCSI Command Lengths
Originally the most significant 3 bits of a SCSI opcode specified the length of the CDB. However, when variable-length CDBs were created this correspondence was changed, and the entire opcode must be examined to determine the CDB length. The lengths are as follows:
| Opcode (hex ) | Length |
|---|---|
| 00h to 1Fh | 6 |
| 20h to 5Fh | 10 |
| 60h to 7Dh | reserved |
| 7Eh | variable (more than 16 bytes) |
| 7Fh | extended (variable length; may contain one or more CDBs) |
| 80H to 9Fh | 16 |
| A0h to BFh | 12 |
| C0h to FFh | vendor specific |
Read more about this topic: SCSI Command
Famous quotes containing the words command and/or lengths:
“By his command these words are cut:
Cast a cold eye
On life, on death.
Horseman, pass by!”
—William Butler Yeats (1865–1939)
“You’ll see certain Pythagoreans whose belief in communism of property goes to such lengths that they pick up anything lying about unguarded, and make off with it without a qualm of conscience as if it had come to them by law.”
—Desiderius Erasmus (c. 1466–1536)
Related Subjects
Related Phrases
Related Words