Avago Technologies LSI53C1010 - Manual (Page 270)

12-4 Debugging the SCRIPTS Processor
Destination SCSI ID SDID Contains the identity of the target for the last
select or reselect instruction executed.
Response ID RESPID0, RESPID1
(wide SCSI devices
only) Contains the IDs that the chip responds to on the
SCSI bus. The chip can respond to multiple IDs,
so more than one bit can be set in these registers.
Table 12.1 Registers Useful for Debugging SCRIPTS Processor (Cont.)
Information Register Remarks