Response id zero (respid0), Response id one, Respid1) – Avago Technologies LSI53C895A User Manual
Page 196: Response id one (respid1), Register: 0x4a, Register: 0x4b
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Registers
Register: 0x4A
Response ID Zero (RESPID0)
Read/Write
RESPID0 and
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
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 chip
can arbitrate with only one ID value in the SCID register.
Register: 0x4B
Response ID One (RESPID1)
Read/Write
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
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 chip
can arbitrate with only one ID value in the SCID register.
7
0
ID
x
x
x
x
x
x
x
x
15
8
ID
x
x
x
x
x
x
x
x