Table 5.43 Dtdc (Data Transfer Disconnect Control) - Hitachi Ultrastar 15K73 Reference Manual

Connect Time Limit is specified by the host computer the maximum time in 100
micro seconds increments which the controller continues connection until
disconnection is initiated.
Connect Time Limit of 0 shows that there is no limit in time.
This field needs to be always specified to 0 as the controller does not support this
field.
Maximum Burst Size is specified by the host computer the maximum data amount
in bytes, in 512 bytes increments, which the controller can transfer per each
connection. (Note : the count one represents 512 bytes.) When the specified data
amount has transferred, the controller disconnects. This field of zero indicates
there is no limitation with the transfer size per connection. This field needs to be
always specified to 0 as the controller does not support this field.
Fair Arbitration is specified whether SCSI bus fairness function.
Fair Arbitration of 000b indicates the controller does not perform SCSI bus
fairness function.
Fair Arbitration of 001b indicates the controller perform SCSI bus fairness
function.
When specified expect 000b and 001b as Fair Arbitration, let the controller be
CHECK CONDITION status by ILLEGAL REQUEST sense key.
DTDC (Data Transfer Disconnect Control) is specified by the host computer as the
conditions that control SCSI bus disconnect.

Table 5.43 DTDC (Data Transfer Disconnect Control)

Bit
2 ,1, 0
000
001
010
011
1XX
Note: X denotes a don't care condition.
MODE SELECT:(15h)
5 COMMAND DESCRIPTIONS
Disconnect control is not implemented. Disconnection is
controlled by the other field in this page.
No disconnection is executed for the period starting the
command transfer over the full data transfer. Connect
Time Limit and Bus Inactivity Limit are ignored during the
data transfer.
Reserved
No disconnection is executed for the period starting the
command transfer, until the command completed.
Connect Time Limit and Bus Inactivity Limit are ignored
after the data transfer started.
Reserved
Disconnect Control
OEM MANUAL:K6602924
Revision: 1 / Date: 2003.03.06
Page: 131 / 273