Tandberg Data
Logical Characteristics
3-10
Tandberg SLR Product Line SCSI Functional Specifications
Data Buffer
Command Buffer
Status Buffer
Data Buffer
Command Buffer
Status Buffer
Command Pointer
Data Pointer
Status Pointer
Current Status Pointer
Current Data Pointer
Current Command Pointer
SCSI
BUS
Saved Command Pointers
for all active commands:
Initiator
Target
Saved Data Pointers for all
active commands:
Saved Status Pointers for
all active commands:
Figure 3-2: SCSI Pointers
The Target may restore the current pointers to their
saved values by sending a RESTORE POINTERS message to
the Initiator. The Initiator moves the saved value of
each pointer into the corresponding current pointer.
Whenever a SCSI device disconnects from the bus, only
the saved pointer values are retained. The current
pointer values are restored from the saved values
automatically upon the next reconnection.
