Fujitsu MAT3300FC 用户手册
C141-C008
2-1
CHAPTER 2 Command Processing
2.1 Command
Format
2.2 Status
Byte
2.3
Outline of Command Processing
2.4
Command Queuing Function
2.5
UNIT ATTENTION Condition
2.6
Sense Data Hold State
2.7
Command Processing Exceptions
2.8
Data Block Addressing
In this chapter, the basic theory and specifications concerning IDD command
processing functions are described.
processing functions are described.
The IDD operates as the target (TARG) in the FC LOOP. In the
explanations given in this chapter, the IDD is labeled “TARG”,
except in cases where a particularly clear distinction is necessary.
explanations given in this chapter, the IDD is labeled “TARG”,
except in cases where a particularly clear distinction is necessary.
2.1 Command Format
Input/Output commands from the INIT (Initiator) to the IDD are executed by the
CDB (Command Descriptor Block). The CDB is information which is transmitted
from the INIT to the TARG in the FCP_CMND frame. In a number of commands,
other than the CDB specifications, parameters which are necessary in executing a
command are specified in the DATA frame. Details concerning these commands
are described in the specifications for individual commands in Chapter 4.
CDB (Command Descriptor Block). The CDB is information which is transmitted
from the INIT to the TARG in the FCP_CMND frame. In a number of commands,
other than the CDB specifications, parameters which are necessary in executing a
command are specified in the DATA frame. Details concerning these commands
are described in the specifications for individual commands in Chapter 4.
The CDB used by the IDD has 3 formats, one with a length of 6, 10 bytes and the
other with a length 12 bytes. The basic format of each respective CDB is shown
in Tables 2.1, 2.2 and 2.3.
other with a length 12 bytes. The basic format of each respective CDB is shown
in Tables 2.1, 2.2 and 2.3.