User`s manual

siop_struc (Command Structure)

SBCSCSI/D1 B-13

Message-Out Buffer Pointer

This field may be modified by the Firmware.

initiator mode

If the MOBUF bit is set, the message-out pointer field contains the address

where a message to the target is placed. Normally, the user does not need to

supply any messages to send to the target. It is recommended to not set the

MOBUF bit in the command control field for normal operation; this feature of

the Firmware is intended to be used for very long extended messages. If the

MOBUF bit is cleared, this field is initialized by the Firmware.

Message-Out Bytes (0-B)

This field may be modified by the Firmware.

initiator mode

If the MOBUF bit cleared, the message-out bytes are where messages to a

target are placed.

Data Count

This field may be modified by the Firmware.

initiator mode

The data count field contains the number of bytes to be transferred during a

data phase on the SCSI bus. If no data phase is to be executed then this field

must be set to zero (0x00000000). This value must not exceed 24 bits

(0xFFFFFF or 16,777,215). If the S/G bit is set in the command control field

then this field is ignored.