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4-86 Registers
Register: 0x4A
Response ID Zero (RESPID0)
Read/Write
RESPIO0 Response ID Zero [7:0]
RESPID0 and Response ID One (RESPID1) contain the
selection or reselection IDs. In other words, these two
8-bit registers contain the ID that the chip responds to on
the SCSI bus. Each bit represents one possible ID with
the most significant bit of RESPID1 representing ID 15
and the least significant bit of RESPID0 representing
ID 0. The SCSI Chip ID (SCID) register still contains the
chip ID used during arbitration. The chip can respond to
more than one ID because more than one bit can be set
in the RESPID1 and RESPID0 registers. However, the
chipcanarbitratewithonlyoneIDvalueintheSCID
register.
Register: 0x4B
Response ID One (RESPID1)
Read/Write
RESPID1 Response ID One [7:0]
Response ID Zero (RESPID0) and RESPID1 contain the
selection or reselection IDs. In other words, these two
8-bit registers contain the ID that the chip responds to on
the SCSI bus. Each bit represents one possible ID with
the most significant bit of RESPID1 representing ID 15
and the least significant bit of RESPID0 representing
ID 0. The SCSI Chip ID (SCID) register still contains the
chip ID used during arbitration. The chip can respond to
more than one ID because more than one bit can be set
in the RESPID1 and RESPID0 registers. However, the
7 0
RESPID0
xxxxxxxx
7 0
RESPID1
xxxxxxxx