Operating Manual U42093-J-Z716-1-74
SCC Addressing Option AppendixB
SCC Addressing Option
Whenthe PSFR-CP41 is configured to use SCC addressing, the unit is capable
of responding as a controller deviceto the FCP Initiator, or routing the FCP
request to a specifiedBUS:TARGET:LUN triplet. When a request using the
PeripheralDevice Addressing Method is received (An FCP command with the
LUN fieldwith bits 7 and 6 of byte 0 are set to 0), the unit routes the request to
thePSFR-CP41, which acts on the command directly. When a request using the
LogicalUnit Addressing Method is received (bits 7 and 6 set to 10b), the request
is routed to the BUS:TARGET:LUNas specified in the defined field.
Host systemsusing SCC addressing will typically do initial device discovery
using the PeripheralDevice Addressing method. On issuing an INQUIRY
command,the host will receive the PSFR-CP41 inquiry data (Appendix C, Table
2),indicating the device type as a controller device. The host will then know on
this basisthat subsequent commands to attached devices will use the Logical
Unit Addressing method. The hostc an performdiscovery by either walking
through the BUS:TARGET:LUNvalues as would a standard SCSI driver, or by
issuinga REPORT LUNS command (Appendix B). This command is sent to the
controller(using the Peripheral Device Addressing Method), and returns a table
indicatingattached devices. The host can then perform actions on these
devicesdirectly without having to perform discovery through all possible combi-
nations.