Fujitsu M2488 manual No Operation code 08h, Restore Pointers code 03h, Save Data Pointer code 02h

M2488 PRODUCT GUIDE SCSI MESSAGES

When a target sends this message, it changes to MESSAGE IN phase and sends this message prior to requesting additional message bytes from the initiator. This provides an interlock so that the initiator can determine which message was rejected.

3-2.13 NO OPERATION code 08h

This message is sent from an initiator in response to a target’s request for a message when the initia- tor does not currently have any other valid message to send.

3-2.14 RESTORE POINTERS code 03h

This message is sent from a target to direct the initiator to restore the most recently saved pointers, for the currently attached logical unit, to the active state. Pointers to the command, data, and status locations for the logical unit are restored to the active pointers. Command and status pointers are restored to the beginning of the present command and status areas. The data pointer is restored to the value at the beginning of the data area in the absence of a SAVE DATA POINTER message or to the value at the point at which the last SAVE DATA POINTER message occurred for that logical unit.

** NOTE **

If a DISCONNECT message is used to break a long data transfer into two or more shorter transfers, then a SAVE DATA POINTER is issued before each DISCONNECT message.

3-2.15 SAVE DATA POINTER code 02h

This message is sent from a target to direct the initiator to save a copy of the present active data pointer for the currently attached logical unit.

April 1997 CG00000-011503 REV. A 3-9