Sun Microsystems 220R - Manual (Page 271)

backplane card in support of the multi-host configuration. The following figure
shows the functionality of the internal SCSi assembly.
C.1.11.5 SCSI ID Selection
The main logic board host adapter is assigned the SCSI identification of 7 for both
ports. The two internal drives attached to the SCA-2 connectors have a SCSI
identification of 0 and 1, while the CD-ROM has an identification of 6.
C.1.12 ASICs
The system unit achieves a high level of integration through application-specific
intergrated circuits (ASICs). All ASICs are 1149.1 (JTAG) compliant. The following
ASICs are highlighted and are described in the following subsections:
4 XB9+
4 QSC
Functional Description 271