Ciprico Rimfire 3880 User Manual Page 186

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21020285 D User’s Guide
Chapter 8 Details of Usage
Page 8 - 12 Target Mode Usage and SCSI Protocol Handling
If a SCSI bus reset occurs after a Target Mode Disable command has been sent
to the RF3880 (at the time the Host is waiting for the TME field of the Target
Selection Data Structure to reflect disabled Target Mode), the following can
be expected:
The Selection Queue will have an entry destined for the Target Selection
Data Structure that has the TME bit clear. There may be other entries in
the Selection Queue completing before this information gets written to
the Target Selection Data Structure. The Host should process these until
receipt of the Target Selection Data Structure associated with the Target
Mode Disable command.
Status Blocks will begin to be returned with 27H set in the Error field.
Target Mode Response commands issued at this time will not be
processed by the RF3880—Status Blocks with an Error field value of
27H will be returned.
Target Mode
Disable
Command
Handling
When the Target Mode Disable command is issued to the RF3880, the adapter
will do the following:
Send a Status Block from the Target Mode Disable command with good
status.
Place after the last entry in the Selection Queue, an entry with the TME
bit clear.
Stop accepting new selections from initiators.
The Host should do the following:
Continue to process entries in the Target Selection
Data Structure until receipt of the entry with the TME bit clear.
Wait for all Target Mode Response command Status Blocks to complete.
Abort
Command
Handling
Event messages occur on the SCSI bus that require the Host to discard a
command. The Abort command is used to do this. When the Abort command
is issued to the RF3880, the adapter will attempt to locate a command with the
indicated Command Identifier. If the command is found, and hasn’t been sent
to the initiator/target, it is aborted.
Synchronous
Data Transfer
Requests
When Synchronous Data Transfers are enabled, (SYN bit set to 1, of the Unit
Flags byte of either the Unit Options, 08H, or Extended Unit Options, 18H,
commands), the adapter will send a Synchronous Data Transfer Request
(SDTR) message whenever it determines that the data transfer agreement is in
an indeterminate state. The adapter will initiate the exchange of SDTR
messages immediately before starting the data transfer phase. The adapter will
also send a SDTR message in response to a SDTR message received from the
initiator.
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