A SCSI Request Block (SRB) contains the command to be executed by the ASPI manager and is used by both drivers and application programs. An SRB consists of an SRB header followed by additional fields dependent on the command code. All request blocks have an 8-byte header.
旼컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴� 쿚ffset �# Bytes 쿏escription 쿝/W* � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴� �00h (00) �01h (01) 쿎ommand Code 쿥 � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴� �01h (01) �01h (01) 쿞tatus 쿝 � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴� �02h (02) �01h (01) 쿓ost Adapter 쿥 � � � 쿙umber � � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴� �03h (03) �01h (01) 쿞CSI Request 쿥 � � � 쿑lags � � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴� �04h (04) �04h (04) 쿝eserved for �- � � � 쿐xpansion = 0 � � 읕컴컴컴컴컴컴컴좔컴컴컴컴컴컴컴좔컴컴컴컴컴컴컴좔컴컴컴컴컴컴컴�
*The R/W column indicates whether the field is sent to ASPI (W), returned from ASPI (R), or reserved (-).
Command Code: The Command Code field indicates which of the ASPI services is being accessed. Refer to ASPI Command Codes.
Status: The Status Byte field is used to post the status of the command. Refer to ASPI Status Bytes.
Host Adapter Number: The Host Adapter Number field specifies which installed host adapter the request is intended for. Host adapter numbers are always assigned by the SCSI manager layer beginning with zero.
SCSI Request Flags: The SCSI Request Flags field definition is command-code specific.
Reserved for Expansion: The last four bytes of the header are reserved and must be zero.