Avago Technologies LSI53C876E - Manual (Page 180)

4-86 Registers
Register: 0x4A
Response ID Zero (RESPID0)
Read/Write
RESPID0 Response ID Zero [7:0]
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
Response ID One (RESPID1) and Response ID Zero
(RESPID0) registers. However, the chip can arbitrate with
only one ID value in the SCSI Chip ID (SCID) register.
Register: 0x4B
Response ID One (RESPID1)
Read/Write
RESPID1 Response ID One [15:8]
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
7 0
ID
x x x x x x x x
15 8
ID
x x x x x x x x