SCSI Primary Commands - 2.pdf

18 July 2001 T10/1236-D Revision 20The FAIR ARBITRATION field indicates whether the target should use fair or unfair arbitration when requesting aninterconnect tenancy. The field may be used to indicate different fairness methods as specified in the individualprotocol documents.A disconnect immediate (DIMM) bit of zero indicates that the target may transfer data for a command during thesame interconnect tenancy in which it receives the command. Whether or not the target does so may depend uponthe target’s internal algorithms, the rules of the applicable SCSI protocol, and settings of the other parameters inthis mode page. A disconnect immediate (DIMM) bit of one indicates that the target shall not transfer data for acommand during the same interconnect tenancy in which it receives the command.The data transfer disconnect control (DTDC) field (see table 160) defines other restrictions on when multiple interconnecttenancies are permitted. A non-zero value in the DTDC field shall take precedence over other interconnecttenancy controls represented by other fields in this mode page.Table 160 — Data transfer disconnect controlDTDC000b001b010b011b100b - 111bDescriptionData transfer disconnect control is not used. Interconnect tenancies are controlledby other fields in this page.A target shall transfer all data for a command within a single interconnect tenancy.ReservedA target shall transfer all data for a command and complete the command within asingle interconnect tenancy.ReservedThe FIRST BURST SIZE field indicates the maximum amount of data that may be transferred to the target for acommand along with the command. This value is expressed in increments of 512 bytes; a value of one means 512bytes, two means 1024 bytes, etc. A value of zero indicates that there is no first burst size limit.dpANS SCSI Primary Commands - 2 (SPC-2) 201